Timeout ошибка http

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This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client’s request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP. The first digit of the status code specifies one of five standard classes of responses. The optional message phrases shown are typical, but any human-readable alternative may be provided, or none at all.

Unless otherwise stated, the status code is part of the HTTP standard (RFC 9110).

The Internet Assigned Numbers Authority (IANA) maintains the official registry of HTTP status codes.^[1]

All HTTP response status codes are separated into five classes or categories. The first digit of the status code defines the class of response, while the last two digits do not have any classifying or categorization role. There are five classes defined by the standard:

• 1xx informational response – the request was received, continuing process
• 2xx successful – the request was successfully received, understood, and accepted
• 3xx redirection – further action needs to be taken in order to complete the request
• 4xx client error – the request contains bad syntax or cannot be fulfilled
• 5xx server error – the server failed to fulfil an apparently valid request

1xx informational response

An informational response indicates that the request was received and understood. It is issued on a provisional basis while request processing continues. It alerts the client to wait for a final response. The message consists only of the status line and optional header fields, and is terminated by an empty line. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not^{[note 1]} send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions.

100 Continue

The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient. To have a server check the request’s headers, a client must send Expect: 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. If the client receives an error code such as 403 (Forbidden) or 405 (Method Not Allowed) then it should not send the request’s body. The response 417 Expectation Failed indicates that the request should be repeated without the Expect header as it indicates that the server does not support expectations (this is the case, for example, of HTTP/1.0 servers).^[2]

101 Switching Protocols

The requester has asked the server to switch protocols and the server has agreed to do so.

102 Processing (WebDAV; RFC 2518)

A WebDAV request may contain many sub-requests involving file operations, requiring a long time to complete the request. This code indicates that the server has received and is processing the request, but no response is available yet.^[3] This prevents the client from timing out and assuming the request was lost. The status code is deprecated.^[4]

103 Early Hints (RFC 8297)

Used to return some response headers before final HTTP message.^[5]

2xx success

This class of status codes indicates the action requested by the client was received, understood, and accepted.^[1]

200 OK

Standard response for successful HTTP requests. The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource. In a POST request, the response will contain an entity describing or containing the result of the action.

201 Created

The request has been fulfilled, resulting in the creation of a new resource.^[6]

202 Accepted

The request has been accepted for processing, but the processing has not been completed. The request might or might not be eventually acted upon, and may be disallowed when processing occurs.

203 Non-Authoritative Information (since HTTP/1.1)

The server is a transforming proxy (e.g. a Web accelerator) that received a 200 OK from its origin, but is returning a modified version of the origin’s response.^[7][8]

204 No Content

The server successfully processed the request, and is not returning any content.

205 Reset Content

The server successfully processed the request, asks that the requester reset its document view, and is not returning any content.

206 Partial Content

The server is delivering only part of the resource (byte serving) due to a range header sent by the client. The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams.

207 Multi-Status (WebDAV; RFC 4918)

The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.^[9]

208 Already Reported (WebDAV; RFC 5842)

The members of a DAV binding have already been enumerated in a preceding part of the (multistatus) response, and are not being included again.

226 IM Used (RFC 3229)

The server has fulfilled a request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.^[10]

3xx redirection

This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection.^[1]

A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request. A user agent should detect and intervene to prevent cyclical redirects.^[11]

300 Multiple Choices

Indicates multiple options for the resource from which the client may choose (via agent-driven content negotiation). For example, this code could be used to present multiple video format options, to list files with different filename extensions, or to suggest word-sense disambiguation.

301 Moved Permanently

This and all future requests should be directed to the given URI.

302 Found (Previously «Moved temporarily»)

Tells the client to look at (browse to) another URL. The HTTP/1.0 specification (RFC 1945) required the client to perform a temporary redirect with the same method (the original describing phrase was «Moved Temporarily»),^[12] but popular browsers implemented 302 redirects by changing the method to GET. Therefore, HTTP/1.1 added status codes 303 and 307 to distinguish between the two behaviours.^[11]

303 See Other (since HTTP/1.1)

The response to the request can be found under another URI using the GET method. When received in response to a POST (or PUT/DELETE), the client should presume that the server has received the data and should issue a new GET request to the given URI.

304 Not Modified

Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match. In such case, there is no need to retransmit the resource since the client still has a previously-downloaded copy.

305 Use Proxy (since HTTP/1.1)

The requested resource is available only through a proxy, the address for which is provided in the response. For security reasons, many HTTP clients (such as Mozilla Firefox and Internet Explorer) do not obey this status code.

306 Switch Proxy

No longer used. Originally meant «Subsequent requests should use the specified proxy.»

307 Temporary Redirect (since HTTP/1.1)

In this case, the request should be repeated with another URI; however, future requests should still use the original URI. In contrast to how 302 was historically implemented, the request method is not allowed to be changed when reissuing the original request. For example, a POST request should be repeated using another POST request.

308 Permanent Redirect

This and all future requests should be directed to the given URI. 308 parallel the behaviour of 301, but does not allow the HTTP method to change. So, for example, submitting a form to a permanently redirected resource may continue smoothly.

4xx client errors

This class of status code is intended for situations in which the error seems to have been caused by the client. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents should display any included entity to the user.

400 Bad Request

The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax, size too large, invalid request message framing, or deceptive request routing).

401 Unauthorized

Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource. See Basic access authentication and Digest access authentication. 401 semantically means «unauthorised», the user does not have valid authentication credentials for the target resource.

Some sites incorrectly issue HTTP 401 when an IP address is banned from the website (usually the website domain) and that specific address is refused permission to access a website.^{[citation needed]}

402 Payment Required

Reserved for future use. The original intention was that this code might be used as part of some form of digital cash or micropayment scheme, as proposed, for example, by GNU Taler,^[14] but that has not yet happened, and this code is not widely used. Google Developers API uses this status if a particular developer has exceeded the daily limit on requests.^[15] Sipgate uses this code if an account does not have sufficient funds to start a call.^[16] Shopify uses this code when the store has not paid their fees and is temporarily disabled.^[17] Stripe uses this code for failed payments where parameters were correct, for example blocked fraudulent payments.^[18]

403 Forbidden

The request contained valid data and was understood by the server, but the server is refusing action. This may be due to the user not having the necessary permissions for a resource or needing an account of some sort, or attempting a prohibited action (e.g. creating a duplicate record where only one is allowed). This code is also typically used if the request provided authentication by answering the WWW-Authenticate header field challenge, but the server did not accept that authentication. The request should not be repeated.

404 Not Found

The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible.

405 Method Not Allowed

A request method is not supported for the requested resource; for example, a GET request on a form that requires data to be presented via POST, or a PUT request on a read-only resource.

406 Not Acceptable

The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request. See Content negotiation.

407 Proxy Authentication Required

The client must first authenticate itself with the proxy.

408 Request Timeout

The server timed out waiting for the request. According to HTTP specifications: «The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time.»

409 Conflict

Indicates that the request could not be processed because of conflict in the current state of the resource, such as an edit conflict between multiple simultaneous updates.

410 Gone

Indicates that the resource requested was previously in use but is no longer available and will not be available again. This should be used when a resource has been intentionally removed and the resource should be purged. Upon receiving a 410 status code, the client should not request the resource in the future. Clients such as search engines should remove the resource from their indices. Most use cases do not require clients and search engines to purge the resource, and a «404 Not Found» may be used instead.

411 Length Required

The request did not specify the length of its content, which is required by the requested resource.

412 Precondition Failed

The server does not meet one of the preconditions that the requester put on the request header fields.

413 Payload Too Large

The request is larger than the server is willing or able to process. Previously called «Request Entity Too Large» in RFC 2616.^[19]

414 URI Too Long

The URI provided was too long for the server to process. Often the result of too much data being encoded as a query-string of a GET request, in which case it should be converted to a POST request. Called «Request-URI Too Long» previously in RFC 2616.^[20]

415 Unsupported Media Type

The request entity has a media type which the server or resource does not support. For example, the client uploads an image as image/svg+xml, but the server requires that images use a different format.

416 Range Not Satisfiable

The client has asked for a portion of the file (byte serving), but the server cannot supply that portion. For example, if the client asked for a part of the file that lies beyond the end of the file. Called «Requested Range Not Satisfiable» previously RFC 2616.^[21]

417 Expectation Failed

The server cannot meet the requirements of the Expect request-header field.^[22]

418 I’m a teapot (RFC 2324, RFC 7168)

This code was defined in 1998 as one of the traditional IETF April Fools’ jokes, in RFC 2324, Hyper Text Coffee Pot Control Protocol, and is not expected to be implemented by actual HTTP servers. The RFC specifies this code should be returned by teapots requested to brew coffee.^[23] This HTTP status is used as an Easter egg in some websites, such as Google.com’s «I’m a teapot» easter egg.^[24][25][26] Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden.^[27][28]

421 Misdirected Request

The request was directed at a server that is not able to produce a response (for example because of connection reuse).

422 Unprocessable Entity

The request was well-formed but was unable to be followed due to semantic errors.^[9]

423 Locked (WebDAV; RFC 4918)

The resource that is being accessed is locked.^[9]

424 Failed Dependency (WebDAV; RFC 4918)

The request failed because it depended on another request and that request failed (e.g., a PROPPATCH).^[9]

425 Too Early (RFC 8470)

Indicates that the server is unwilling to risk processing a request that might be replayed.

426 Upgrade Required

The client should switch to a different protocol such as TLS/1.3, given in the Upgrade header field.

428 Precondition Required (RFC 6585)

The origin server requires the request to be conditional. Intended to prevent the ‘lost update’ problem, where a client GETs a resource’s state, modifies it, and PUTs it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.^[29]

429 Too Many Requests (RFC 6585)

The user has sent too many requests in a given amount of time. Intended for use with rate-limiting schemes.^[29]

431 Request Header Fields Too Large (RFC 6585)

The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large.^[29]

451 Unavailable For Legal Reasons (RFC 7725)

A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource.^[30] The code 451 was chosen as a reference to the novel Fahrenheit 451 (see the Acknowledgements in the RFC).

5xx server errors

The server failed to fulfil a request.

Response status codes beginning with the digit «5» indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents should display any included entity to the user. These response codes are applicable to any request method.

500 Internal Server Error

A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.

501 Not Implemented

The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API).

502 Bad Gateway

The server was acting as a gateway or proxy and received an invalid response from the upstream server.

503 Service Unavailable

The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state.^[31]

504 Gateway Timeout

The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.

505 HTTP Version Not Supported

The server does not support the HTTP version used in the request.

506 Variant Also Negotiates (RFC 2295)

Transparent content negotiation for the request results in a circular reference.^[32]

507 Insufficient Storage (WebDAV; RFC 4918)

The server is unable to store the representation needed to complete the request.^[9]

508 Loop Detected (WebDAV; RFC 5842)

The server detected an infinite loop while processing the request (sent instead of 208 Already Reported).

510 Not Extended (RFC 2774)

Further extensions to the request are required for the server to fulfil it.^[33]

511 Network Authentication Required (RFC 6585)

The client needs to authenticate to gain network access. Intended for use by intercepting proxies used to control access to the network (e.g., «captive portals» used to require agreement to Terms of Service before granting full Internet access via a Wi-Fi hotspot).^[29]

Unofficial codes

The following codes are not specified by any standard.

218 This is fine (Apache HTTP Server)

Used by Apache servers. A catch-all error condition allowing the passage of message bodies through the server when the ProxyErrorOverride setting is enabled. It is displayed in this situation instead of a 4xx or 5xx error message.^[34]

419 Page Expired (Laravel Framework)

Used by the Laravel Framework when a CSRF Token is missing or expired.^{[citation needed]}

420 Method Failure (Spring Framework)

A deprecated response used by the Spring Framework when a method has failed.^[35]

420 Enhance Your Calm (Twitter)

Returned by version 1 of the Twitter Search and Trends API when the client is being rate limited; versions 1.1 and later use the 429 Too Many Requests response code instead.^[36] The phrase «Enhance your calm» comes from the 1993 movie Demolition Man, and its association with this number is likely a reference to cannabis.^{[citation needed]}

430 Request Header Fields Too Large (Shopify)

Used by Shopify, instead of the 429 Too Many Requests response code, when too many URLs are requested within a certain time frame.^[37]

450 Blocked by Windows Parental Controls (Microsoft)

The Microsoft extension code indicated when Windows Parental Controls are turned on and are blocking access to the requested webpage.^[38]

498 Invalid Token (Esri)

Returned by ArcGIS for Server. Code 498 indicates an expired or otherwise invalid token.^[39]

499 Token Required (Esri)

Returned by ArcGIS for Server. Code 499 indicates that a token is required but was not submitted.^[39]

509 Bandwidth Limit Exceeded (Apache Web Server/cPanel)

The server has exceeded the bandwidth specified by the server administrator; this is often used by shared hosting providers to limit the bandwidth of customers.^[40]

529 Site is overloaded

Used by Qualys in the SSLLabs server testing API to signal that the site can’t process the request.^[41]

530 Site is frozen

Used by the Pantheon Systems web platform to indicate a site that has been frozen due to inactivity.^[42]

598 (Informal convention) Network read timeout error

Used by some HTTP proxies to signal a network read timeout behind the proxy to a client in front of the proxy.^[43]

599 Network Connect Timeout Error

An error used by some HTTP proxies to signal a network connect timeout behind the proxy to a client in front of the proxy.

Internet Information Services

Microsoft’s Internet Information Services (IIS) web server expands the 4xx error space to signal errors with the client’s request.

440 Login Time-out

The client’s session has expired and must log in again.^[44]

449 Retry With

The server cannot honour the request because the user has not provided the required information.^[45]

451 Redirect

Used in Exchange ActiveSync when either a more efficient server is available or the server cannot access the users’ mailbox.^[46] The client is expected to re-run the HTTP AutoDiscover operation to find a more appropriate server.^[47]

IIS sometimes uses additional decimal sub-codes for more specific information,^[48] however these sub-codes only appear in the response payload and in documentation, not in the place of an actual HTTP status code.

nginx

The nginx web server software expands the 4xx error space to signal issues with the client’s request.^[49][50]

444 No Response

Used internally^[51] to instruct the server to return no information to the client and close the connection immediately.

494 Request header too large

Client sent too large request or too long header line.

495 SSL Certificate Error

An expansion of the 400 Bad Request response code, used when the client has provided an invalid client certificate.

496 SSL Certificate Required

An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided.

497 HTTP Request Sent to HTTPS Port

An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests.

499 Client Closed Request

Used when the client has closed the request before the server could send a response.

Cloudflare

Cloudflare’s reverse proxy service expands the 5xx series of errors space to signal issues with the origin server.^[52]

520 Web Server Returned an Unknown Error

The origin server returned an empty, unknown, or unexpected response to Cloudflare.^[53]

521 Web Server Is Down

The origin server refused connections from Cloudflare. Security solutions at the origin may be blocking legitimate connections from certain Cloudflare IP addresses.

522 Connection Timed Out

Cloudflare timed out contacting the origin server.

523 Origin Is Unreachable

Cloudflare could not reach the origin server; for example, if the DNS records for the origin server are incorrect or missing.

524 A Timeout Occurred

Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.

525 SSL Handshake Failed

Cloudflare could not negotiate a SSL/TLS handshake with the origin server.

526 Invalid SSL Certificate

Cloudflare could not validate the SSL certificate on the origin web server. Also used by Cloud Foundry’s gorouter.

527 Railgun Error

Error 527 indicates an interrupted connection between Cloudflare and the origin server’s Railgun server.^[54]

530

Error 530 is returned along with a 1xxx error.^[55]

AWS Elastic Load Balancing

Amazon Web Services’ Elastic Load Balancing adds a few custom return codes to signal issues either with the client request or with the origin server.^[56]

460

Client closed the connection with the load balancer before the idle timeout period elapsed. Typically when client timeout is sooner than the Elastic Load Balancer’s timeout.^[56]

463

The load balancer received an X-Forwarded-For request header with more than 30 IP addresses.^[56]

464

Incompatible protocol versions between Client and Origin server.^[56]

561 Unauthorized

An error around authentication returned by a server registered with a load balancer. You configured a listener rule to authenticate users, but the identity provider (IdP) returned an error code when authenticating the user.^[56]

Caching warning codes (obsoleted)

The following caching related warning codes were specified under RFC 7234. Unlike the other status codes above, these were not sent as the response status in the HTTP protocol, but as part of the «Warning» HTTP header.^[57][58]

Since this «Warning» header is often neither sent by servers nor acknowledged by clients, this header and its codes were obsoleted by the HTTP Working Group in 2022 with RFC 9111.^[59]

110 Response is Stale

The response provided by a cache is stale (the content’s age exceeds a maximum age set by a Cache-Control header or heuristically chosen lifetime).

111 Revalidation Failed

The cache was unable to validate the response, due to an inability to reach the origin server.

112 Disconnected Operation

The cache is intentionally disconnected from the rest of the network.

113 Heuristic Expiration

The cache heuristically chose a freshness lifetime greater than 24 hours and the response’s age is greater than 24 hours.

199 Miscellaneous Warning

Arbitrary, non-specific warning. The warning text may be logged or presented to the user.

214 Transformation Applied

Added by a proxy if it applies any transformation to the representation, such as changing the content encoding, media type or the like.

299 Miscellaneous Persistent Warning

Same as 199, but indicating a persistent warning.

See also

• Custom error pages
• List of FTP server return codes
• List of HTTP header fields
• List of SMTP server return codes
• Common Log Format

Explanatory notes

References

External links

• «RFC 9110: HTTP Semantics and Content, Section 15 «Status Codes»«.
• Hypertext Transfer Protocol (HTTP) Status Code Registry at the Internet Assigned Numbers Authority
• HTTP status codes at http-statuscode.com
• MDN status code reference at mozilla.org

HTTP response status code 408 Request Timeout is a client error that is returned by the server to indicate that a request is coming in too slowly from a client and it is unwilling to wait for it to be completed, thus terminating the connection.

Usage

When the 408 Request Timeout error message is received, it means that a client has initiated a request but for some reason, it has not been transmitted in full. This may occur because an internet connection is very slow, or has been dropped. The response will include the Connection header, specifying that it has been closed.

Upon receiving the Connection: close header, the client can attempt the request again.

Example

In the example, the client begins to send a 10K PDF file to the server, but the connection is suffering from intermittent connectivity issues and the server concludes that the transmission, in its entirety, is too slow. As such, it cancels the HTTP request and closes the connection. Sometime later, when the connection is more stable, the client attempts to retransmit the file and it is successful.

Initial request

PUT /docs HTTP/1.1
Host: www.example.re
Content-Type: applications/pdf
Content-Length: 10000

Initial response

HTTP/1.1 408 Request Timeout
Connection: Close
Content-Type: text/html
Content-Length: 198

<html>
  <head>
    <title>Connection Close</title>
  </head>
  <body>
   <p>The transmission was not received quickly enough. Check internet connectivity and please try again.</p>
  </body>
</html>

Next request

PUT /docs HTTP/1.1
Host: www.example.re
Content-Type: applications/pdf
Content-Length: 10000

<File transfer successful for PDF file>

Final response

HTTP/1.1 200 OK

Code references

.NET

HttpStatusCode.RequestTimeout

Rust

http::StatusCode::REQUEST_TIMEOUT

Rails

:request_timeout

Go

http.StatusRequestTimeout

Symfony

Response::HTTP_REQUEST_TIMEOUT

Python3.5+

http.HTTPStatus.REQUEST_TIMEOUT

Java

java.net.HttpURLConnection.HTTP_CLIENT_TIMEOUT

Apache HttpComponents Core

org.apache.hc.core5.http.HttpStatus.SC_REQUEST_TIMEOUT

Angular

@angular/common/http/HttpStatusCode.RequestTimeout

Takeaway

The 408 Request Timeout status code is a client error that the server sends when an HTTP request is taking too long to complete. Common reasons for this are slow or broken internet connections. If the connection is restored, the client can make the request again.

See also

• Connection
• 504 Gateway Timeout
• RFC 7231

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Иногда при посещении отдельных страниц сайта мы сталкиваемся с тем, что на экране вместо желаемого контента появляется сообщение об ошибке с цифровым кодом. Для «непосвященного» пользователя это просто набор цифр, но на самом деле в этих цифрах заложена определенная информация. Все они группируются по видам причин возникновения сбоя. 

Сообщения, кодирующиеся в формате 5хх, говорят о проблеме на стороне сервера, например, когда невозможно выполнить запрос из-за нарушения связи между несколькими серверами. Ошибка 504 Gateway Time Out не является распространенной, но это не значит, что на нее не стоит обращать внимания, особенно владельцу сайта. Рассмотрим некоторые причины возникновения данной ошибки и способы ее устранения как на стороне обычного посетителя, так и администратором веб-ресурса.

Ошибка 504 Gateway Time Out – это код состояния HTTP, который появляется, когда в течение заданного периода времени один сервер не получает своевременный ответ от другого сервера, который действует как шлюз или прокси.

Описания ошибки могут иметь различную форму:

• 504 Gateway Timeout nginx
• Gateway Timeout Error
• HTTP Error 504
• 504 Gateway Time-out – The server didn’t respond in time
• HTTP Error 504 – Gateway Timeout

Наличие дополнительного словесного описания помогает конкретизировать причину возникновения сбоя. 

Что делать посетителю сайта при возникновении ошибки 504 

Итак, вы столкнулись с появлением на экране сообщения «error 504». Не спешите уходить с сайта, ведь возникновение сбоя может говорить о неправильной работе вашего браузера или даже наличии более серьезных проблем на уровне пользовательского софта. Попробуйте произвести довольно простые действия, чтобы убедиться, что с вашим программным обеспечением и настройками все в порядке. 

1. Перезагрузите проблемную страницу или текущий браузер. Если проблема устранилась и не повторяется вновь, особенно при посещении других сайтов, о ней можно просто забыть. При регулярном возникновении однотипных ошибок во время посещения разных ресурсов стоит покопаться в настройках собственного ПО поглубже.
2. Зайдите на тот же самый сайт, где возникла ошибка сервера 504, используя альтернативный браузер. В случае, когда страница во время тестирования открылась корректно, обновите браузер, в котором случился сбой, до последней версии.
3. Проверьте, как открываются страницы этого же сайта с другого компьютера или смартфона. Это позволит вам понять, не связано ли появление ошибки 504 с ПО конкретного устройства.
4. При регулярном появлении HTTP ошибок, в т.ч. с кодом 504, очистите кэш браузера, удалите файлы cookies. Со временем в любом браузере накапливается много «мусора». Произведя очистку, вы поможете программе работать более корректно и даже быстрее.
5. Произведите сброс настроек роутера или модема, отключив оборудование на некоторое время от сети. Данная операция вряд ли приведет к устранению ошибки 504, но может улучшить качество интернет-соединения. Провайдеры регулярно вносят изменения в настройки собственного софта, обновляют его. Иногда это приводит к конфликту в корректном взаимодействии пользовательского оборудования и серверов оператора. Перезагрузка устройства по питанию в большинстве случаев решает такие проблемы.
6. Очистите кэш DNS. Данная операция кажется сложной для обычного пользователя, но на деле выполнить ее достаточно легко. Способ очистки зависит от вашей операционной системы, найдите соответствующий мануал в интернете.
7. Для опытных пользователей подойдет рекомендация временно переключить DNS-сервер на Google Public DNS, что как минимум поможет определить, возник ли ошибочный код состояния HTTP по причине DNS проблемы. 

Если после проведения всех вышеозначенных рекомендаций любая ошибка, в т.ч. 504 Gateway Time Out, продолжает возникать регулярно, обратитесь в техподдержку проблемного интернет-ресурса. 

Решение проблем с появлением ошибки сервера 504 администратором веб-ресурса 

Некорректная работа сайта чаще всего просто раздражает посетителя и приводит к тому, что пользователь находит альтернативный ресурс. Для владельца сайта такие сбои могут носить более глобальные последствия. Поэтому очень важно своевременно обнаруживать баги и максимально быстро устранять их. Для раннего мониторинга стоит использовать все возможные инструменты: 

• проводить регулярную симуляцию пользовательского поведения на сайте;
• настроить автоматизированный мониторинг работоспособности ресурса как встроенными инструментами администрирования, так и с использованием специальных скриптов;
• обеспечить качественную работу службы технической поддержки сайта, своевременную обработку всех поступающих сообщений, особенно связанных с информацией о появлении разного рода ошибок на стороне пользователя. 

Соблюдение последнего правила не только позволит практически без дополнительных затрат отслеживать все возможные проблемы, которые возникают при посещении сайта. Своевременная обработка пользовательских запросов, быстрый ответ, выдача рекомендаций и публичное обсуждение повышают лояльность и создают дополнительный PR-эффект.

Почти все ошибки с кодом 5хх, возникающие из-за невозможности обработки определенного количества запросов, поступающих на сервер, решаются методом апгрейда железа (использованием высокопроизводительного хостинга) либо оптимизацией работы программного обеспечения. Второй способ зависит от вида движка, на котором создан конкретный сайт. При использовании условно-бесплатных программ (WordPress, OpeneCart и других) все проблемы придется решать на уровне администрирования, с привлечением конкретного веб-программиста, разработавшего данный сайт. Если баги возникают на платных платформах (1С-Битрикс, UMI.CMS, NetCat CMS), напишите об ошибке 504 Gateway Time Out в техподдержку разработчика. Отправить сообщение о проблеме следует и разработчикам платных скриптов, если они установлены на вашем сайте, и вы считаете, что сбои возникают по причине их некорректного исполнения. 

Вот некоторые причины, приводящие к возникновению ошибки 504 Gateway Time Out

• Резкий скачок нагрузки на сайт вследствие поступления большого количества внешних запросов, вызванного DDoS-атаками или действиями вирусного ПО, пиковым посещением сайта, например, в момент проведения различных акций в интернет-магазине, или единовременной загрузкой на сайт большого объема контента (импорт информации из CSV- или XML-файлов).
• Некорректная работа скриптов, плагинов и дополнений, конфликтующих как между собой, так и внутри.
• Превышение лимита доступных ресурсов при использовании виртуального хостинга.

Еще одна возможная причина возникновения ошибки 504 – исполняемый скрипт не укладывается в отведенный лимит времени. Это бывает, когда скрипт обращается к другим сайтам либо просто выполняет тяжелую операцию, например, строит поисковый индекс.

Рекомендации по устранению ошибки 504 Gateway Time Out методами администрирования сайта

Ошибка 504 Gateway Time Out может быть вызвана недавними изменениями или обновлениями на сайте. Если после отката к состоянию, предшествующему изменениям, баг исчез, следует найти конкретное действие, повлекшее возникновение ошибки. Для этого необходимо проверить журнал ошибок соответствующей CMS. Пользователи WordPress могут включить журналирование ошибок в файле wp-config.php добавлением следующих строк: 

define( 'wp_debug', true );

define( 'wp_debug_log', true );

define( 'wp_debug_display', false )

Все возникающие варианты ошибок будут записаны в файле wp-contents/debug.log.

Для проверки работоспособности плагинов и расширений попробуйте отключить те, которые вызывают подозрение как источники возникновения ошибки 504. В первую очередь это касается устаревших скриптов, но причиной могут оказаться и обновления. Если проблема исчезла, далее следует найти некорректный плагин или дополнение и устранить или исправить его. Один из способов улучшения работы исполняемого скрипта – увеличить значение параметра PHP max_execution_time или облегчить скрипт.

При использовании CDN для более быстрого получения контента, в частности CloudFlare, который работает как CDN и как сервис предотвращения негативных последствий от DDoS, вы можете столкнуться с двумя типами ошибок 504. В случае возникновения проблемы на стороне CloudFlare лучшим решением будет связаться с поддержкой CloudFlare или отключить его. Второй вариант – когда сбой возникает на стороне хостинг-провайдера. В этой ситуации также необходимо обратиться в службу поддержки хостера.

Часто ошибку 504 можно видеть на серверах, где используется VPS-хостинг и установлен Nginx в качестве фронтенда и Apache в качестве бэкенда. Для устранения проблемы в Apache можно увеличить значение timeout по умолчанию в файле httpd.conf:

# Timeout: The number of seconds before receives and sends time out.

Timeout 600

Также увеличить лимит в max_execution_time в php.ini: 

После внесения изменений следует перезапустить Apache. Ошибка 504 Gateway Time Out должна исчезнуть.

Аналогичным образом проблема с появлением ошибки HTTP 504 решается пользователями Nginx. Попробуйте увеличить такие параметры в файле /etc/nginx/conf.d/timeout.conf:

proxy_connect_timeout 600;

proxy_send_timeout 600;

proxy_read_timeout 600;

send_timeout 600;

Также рекомендуется увеличить max_execution_time в php.ini:

Далее перезапустите Nginx и откройте сайт. 

И далее внести соответствующие изменения.

Аналогичным способом проблема устраняется и при использовании альтернативных панелей управления хостингом – Ajenti, CentOS Web Panel, ISPmanager и других.

Если вы считаете, что появление 504 Gateway Timeout вызвано превышением лимита использования ресурсов серверного железа, оптимальным решением будет аренда выделенного сервера или VPS. Когда ваш сайт уже размещен на виртуальном хостинге, но ни одна из рекомендаций не привела к исправлению error 504, обратитесь к хостинг-провайдеру. В этом случае подробно опишите причины, которые, как вы полагаете, привели к появлению сбоя.

Заключение

В данной статье мы рассмотрели основные причины возникновения ошибки HTTP 504 Gateway Timeout и популярные способы устранения неполадки. Уверен, некоторые администраторы веб-ресурсов сталкивались с подобными проблемами, выходящими за рамки приведенных примеров и рекомендаций.

Буду благодарен, если вы поделитесь своим опытом в комментариях.

Are you familiar with the frustration of encountering a 408 Request Timeout error while browsing a website?

This error occurs when your web browser fails to receive a timely response from the server, disrupting your browsing experience.

But don’t worry! This step-by-step guide will help you troubleshoot and fix the annoying HTTP 408 Request Timeout error.

Whether you’re unsure about the meaning of the error message or what’s causing it, we’ve got you covered. So let’s delve into the HTTP 408 status code, explore its common causes, and present you with potential solutions to get you back to smooth browsing.

What Does the HTTP 408 Error Code Mean

HTTP 408 status code is returned when a server timeout occurs due to a slow client request. It means the server terminated the connection, resulting in the client receiving the 408 Request Timeout message.

HTTP status codes communicate request status and can redirect clients to different resources. Common codes include:

• 200 (OK)
• 400 (Bad Request)
• 500 (Internal Server Error)

These status codes can be categorized into 5 groups:

It is worth mentioning that the HTTP 408 error differs from the 504 Gateway Timeout status code, which is typically associated with the gateway or proxy servers. In contrast, the 408 error is directly generated by the web server with which the client is communicating.

Exploring Common Causes of the HTTP 408 Request Timeout Error

The occurrence of a 408 Request Timeout error can be attributed to various factors. Let’s delve into the 5 common triggers:

1. Server Overload

When a server becomes overwhelmed with numerous incoming requests, it may struggle to respond to all of them within the allocated time. Consequently, some requests may time out, resulting in the 408 error.

2. Network Issues

A weak or unreliable internet connection can also contribute to a 408 Request Timeout error.

3. Large File Downloads

Attempting to download large files, such as videos or images, can lead to a 408 Request Timeout error. If the server slowly transmits the file, the browser may assume the request has failed due to the extended waiting time.

4. Server Maintenance

During server maintenance or updates, the server may undergo temporary periods of unavailability. Accessing the server during these times can result in a 408 error as it cannot respond to the request.

5. Firewall or Security Settings

In some cases, strict firewall or security settings can interfere with the communication between your browser and the server. This can result in a request timeout if the server’s response is blocked or delayed.

6. Proxy Server Issues

If you are using a proxy server to connect to the internet, misconfigured settings or connection problems with the proxy server can cause a 408 error. The proxy server may fail to establish a timely connection with the destination server, resulting in a timeout.

If you’re experiencing some other issue, you might want to check out our guide on common WordPress issues.

How to Resolve the HTTP 408 Error (8 Easy Solutions)

Now that we have understood the HTTP 408 status code, let’s explore the solutions to resolve it. Below, we will discuss potential remedies from both the client-side and server-side perspectives.

Addressing the Issue on the Client Side

Client-side refers to the user’s side, where the web browser or application is making the request to the server. Client-side issues can include network problems, browser settings, or large file downloads that may cause the request to time out.

Here are a few solutions from the client side that can help resolve the HTTP 408 error:

1. Review Recent Database Modifications

Consider recent database changes as a potential cause of the HTTP 408 error. Revert any recent modifications to resolve the issue.

Pay attention to the installed extensions or updates that may have altered database records, leading to conflicts or errors. For example, check a specific table modified by a new plugin using a database management tool like phpMyAdmin.

Also, manually review recently modified tables or records for changes causing the HTTP 408 error. Revert problematic alterations to their original states.

2. Perform a Site Backup

You should prioritize website backup as a precaution for troubleshooting the HTTP 408 error. We recommend creating a comprehensive backup to secure your files and database.

There are various methods available to back up your website. Below are the two easy approaches for website backup:

Methods for website backup:

Method #1. Manual method using SFTP client like FileZilla:

• Obtain SFTP credentials from the hosting provider.
• Connect to the server and download files from the root directory (typically in the public_html folder).

Method #2. Cloudways users:

• Use the Cloudways platform to create backups conveniently and ensure data safety.

First, we’ll cover backup creation using the Cloudways platform, then explore the manual backup process.

How to Backup Your Application Using the Cloudways Platform

Here is a step-by-step guide on how to download the backup of your application from the Cloudways platform to your local computer:

• Step 1: Log in to the Cloudways platform and select the target server.

• Step 2: Go to Backups in the left menu and enable Local Backups.

Optional: Click Take Backup Now for an immediate backup.

• Step 3: Connect to your server via SFTP (Secure File Transfer Protocol) using your Master Credentials to establish the remote server connection.

• Step 4: Navigate to /applications/<your_application_name>/local_backups.

Note: Only the most recent backup is available locally. Off-site backups follow the scheduled frequency and settings.

By following these steps, you will successfully backup your application using the Cloudways platform.

How to Manually Backup & Download WordPress Files Via an FTP Client

To backup your WordPress files using an FTP client, follow these steps:

• Navigate to your WordPress site’s root directory.

• Set up an FTP connection with the destination storage using FTP credentials, host IP address, and port number.
• Launch an FTP client like FileZilla.
• Enter the credentials and click on “Quickconnect” to initiate a connection with the server.

• Select all the files and folders you want to back up. These typically include the entire WordPress installation directory.
• Download the selected files and folders to your local host or storage location.

Note: Using the backup functionality provided by the Cloudways platform offers a simpler and user-friendly experience. It saves time and effort compared to manual FTP backups.

3. Verify the URL

Sometimes, the HTTP 408 error can occur if a URL requiring specific credentials is accidentally requested, resulting in a request timeout.

Possible cause: Mistyping the URL in the browser. We recommend doing the following measures:

• Check the URL for typos, including the domain name, slashes, and hyphens.
• Re-enter the URL and refresh the page if a typo is suspected.

If the request timeout error persists, proceed to the next troubleshooting step.

4. Revert Recent Updates

To roll back recent changes and resolve the HTTP 408 error on your WordPress site, consider restoring your site to a previous version if recent changes (e.g., new plugin installation or WordPress update) caused the error.

And if you’re a Cloudways user, you can take advantage of its point-in-time restore feature, which includes automated offsite server-level backups and on-demand application-level backups.

Note: Cloudways Autoscale users can refer to this specific guide for instructions.

Now let’s restore a point-in-time backup using Cloudways Flexible:

• Log in to the Cloudways Platform.

• Navigate to “Servers” and select the server with your desired application.

• Click on the application name under the “www” section.

• Under “Application Management,” select “Backup and Restore.”

• Select the desired restore point from the dropdown.
• Click “Restore Application Now.”

Important considerations:

• Ensure sufficient disk space before restoring.
• Choose complete restore or specific file/database restore based on your needs.

• Restore duration depends on application data size.
• You will receive a notification upon completion.

By following these steps, you can perform a point-in-time restore of your Cloudways application, helping you revert to a previous version and potentially resolving the HTTP 408 error.

5. Remove Extensions and Plugins

Adding extensions and plugins to your website can sometimes lead to compatibility issues and errors, including the HTTP 408 status code. To investigate if this is the cause, you can perform the following steps:

• Deactivate all plugins in the WordPress dashboard:
  • Navigate to the Plugins section and select all installed plugins.
  • From the Bulk Actions dropdown menu, choose “Deactivate” and click “Apply.”

• Alternative deactivation method: In case you are unable to access the dashboard, you can connect to your site via SFTP and rename the plugins folder to something like “plugins_old”. This action will effectively deactivate all plugins.

• Check if the error is resolved after deactivation. Reactivate plugins one by one and observe if the error reoccurs. Identify the problematic plugin causing the error.

• Uninstall the problematic plugin and consider finding a suitable alternative or contacting the developer for further assistance.

By systematically deactivating and reactivating plugins, you can identify and resolve the plugin-related cause of the HTTP 408 error on your website.

Addressing the Issue on the Server-Side

Server-side refers to the server receiving and processing the client’s requests. Server-side issues can include server overload, maintenance, or misconfigurations that lead to the server being unable to respond within the allocated time, resulting in the 408 error.

The issue likely lies on the server side if the previous solutions did not resolve the HTTP 408 error. In such cases, it is necessary to explore alternative solutions to resolve the error.

6. Review Application Logs

You can troubleshoot the HTTP 408 error from a server-side perspective in two ways.

If you use WordPress, you can access logs by enabling the WordPress debugging mode in the wp-config.php file. Simply insert the following code:

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

For Cloudways users, monitoring application logs through the Cloudways Platform offers a convenient option. Here’s how you can do it:

• Log in to the Cloudways Platform and select your desired application.
• Navigate to the “Monitoring” section and click on “Logs.”

• Click the “Access Logs” section to view recent log entries or the “Error Logs” to view recent Apache error logs.

By accessing and analyzing server-side logs, you can gather crucial information to diagnose and address the HTTP 408 error from a server-side perspective.

7. Troubleshoot Apps or Scripts

Debugging refers to the process of identifying and resolving bugs or errors in your code. If you are still encountering the HTTP 408 error on your website, it is necessary to debug your site. To simplify the bug monitoring process for your WordPress site, you can utilize WordPress debugging plugins.

1. Query Monitor

Query Monitor is a WordPress plugin that adds a developer tool panel to your WordPress dashboard. It offers database queries, PHP errors, HTTP API calls, hooks and actions, editor block disabling, and enqueued scripts and stylesheets.

With Query Monitor, you can gather extensive information for effective debugging.

2. New Relic

Another option for comprehensive debugging is New Relic, a premium tool. It provides monitoring of user experience, mapping the WordPress architecture, identifying broken permalinks, analyzing site performance, and proactively detecting anomalies.

New Relic helps you gather troubleshooting data and ensures an optimal experience for your visitors.

Troubleshooting via Application Performance Monitoring

Another option is utilizing an Application Performance Monitoring (APM) tool to help you monitor and optimize your site’s performance.

Here’s how you can use the New Relic APM feature on the Cloudways platform to monitor your application:

• Log in to your New Relic account.

• Open the User Menu and select API Keys.
• Locate your license key labeled as “Original account license key.” Click on the ellipsis (…) to view more options.
• Copy your license key.

• Log in to the Cloudways Platform.
• Go to Servers and choose the desired server.

• Under Server Management, select Monitoring and switch to the New Relic tab.

• Enter your New Relic License Key and save the changes.

• Enable the New Relic service in Server Management > Manage Services.

• Start monitoring your applications through New Relic APM.

Using WordPress debugging plugins or premium tools like New Relic and employing an APM tool can simplify your WordPress site’s monitoring and troubleshooting process, enhancing its functionality.

8. Validate Server Configuration Files

If you are still experiencing the HTTP 408 error and want to identify its cause, you can check your server configuration files using SFTP. The specific steps may vary depending on whether your server is running on Apache or Nginx.

For Apache users:

• Locate the .htaccess file in your site’s root directory.
• Open the file and search for the lines containing “KeepAliveTimeout” and “RequestReadTimeout”.
• Comment out these lines by adding “#” at the beginning of each line.
• Save the file and then reload the page in your browser.

In the case of a WordPress site hosted on an Apache Web Server, follow these steps to access and edit the .htaccess file:

• Connect to your server using an FTP client like FileZilla.

• Navigate to the root folder of your WordPress application (e.g., “/applications/sqzucfcyqb/public_html”).

• Locate the .htaccess file within the “public_html” folder.

• Right-click on the file and select the “View/Edit” option to open it in a text editor.

• Make the necessary changes to the file and save it.

Following these steps, you can fix the HTTP 408 Request Timeout error.

4 Tips to Avoid a 408 Request Timeout Error

Here are 5 effective measures to prevent a 408 Request Timeout error and improve your browsing experience:

1. Use a Reliable Internet Connection:

Ensure you have a stable Internet connection to minimize the chances of encountering a 408 error. Consider upgrading your plan or switching to a different Internet service provider if necessary.

2. Keep Your Browser and Operating System Up-To-Date:

Regularly update your browser and operating system to avoid compatibility issues and ensure a smooth and secure browsing experience.

3. Clear Your Browser Cache Regularly:

Periodically clear your browser cache to prevent website loading issues. This can be done by accessing your browser settings and clearing the cache manually or setting up automated cache clearing at regular intervals.

4. Avoid Downloading Large Files:

Downloading large files can strain the server and increase the likelihood of a 408 error. Consider using a download manager or splitting large files into smaller parts to avoid encountering this problem.

5. Disable or Adjust Firewall and Security Settings:

In some cases, overactive firewall or security settings can interfere with the communication between your browser and the server, resulting in a request timeout. Temporarily disabling or adjusting these settings can help troubleshoot the issue.

Summary

The 408 Request Timeout error occurs when the server terminates the connection due to a request taking too long to complete. And resolving this error involves taking several steps to identify and address the underlying causes. Here’s a summary of the key actions to take:

• Review recent changes: Roll back any recent website or server configuration modifications that may be causing the timeout error.

• Check server configuration and logs: Analyze your server configuration files and application logs to detect any misconfigurations or errors that could be causing the issue.

• Debug applications and scripts: Identify and address any coding errors or inefficiencies in your applications and scripts that could be causing the request timed out error.

By following these troubleshooting steps, you can increase your chances of resolving the 408 error and improving your overall browsing experience.

Remember to maintain a stable internet connection, keep your browser and operating system up to date, avoid downloading large files excessively, and regularly clear your browser cache to minimize the risk of encountering timeout errors.

Other 4XX Errors and How to Fix Them

• How to Fix WordPress 403 Forbidden Error
• How to Fix 405 Method Not Allowed in WordPress
• Fix the “413 Request Entity Too Large” Error in WordPress
• How to Fix 429 Too Many Requests Error in WordPress
• Fix the “413 Request Entity Too Large” Error in WordPress

FAQs

How do I fix a 408 request timeout step by step?

Follow the steps below to fix a 408 request timeout error:

• Safely back up your website.
• Verify the accuracy of the URL.
• Evaluate recent database modifications.
• Remove or disable extensions and plugins.
• Revert recent changes to your website.
• Review server configuration files.
• Examine application logs for insights.
• Debug applications or scripts as needed.

What causes a 408 error?

A 408 Request Timeout error typically occurs when the server terminates the connection because the requested operation exceeds the timeout period. It happens when the server waits for additional information from the client, which is not provided within the specified timeframe. Resultingly, the server sends a 408 Request Timeout message to the client, indicating a delayed request.

How does Error 408 affect the speed of your webpage?

Error 408, or the Request Timeout error, does not directly affect webpage speed. It is a communication issue between the client and the server. The impact on webpage speed is minimal.

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