417 ошибка http - TopOshibok.ru - решение и исправление самых разных ошибок

HTTP response status code 417 Expectation Failed is a client error that is returned by the server to indicate that the conditions set by the client using the Expect header can not be satisfied.

Table of Contents

Usage
- Special consideration for clients
- Special consideration for servers
- Example
Code references
Takeaway
See also

Usage

When the 417 Expectation Failed error message is received, it implies that the client specified one or more conditions for proactive negotiation in the Expect header of the request. This is related to the informational HTTP response 100 Continue.

When a request is submitted using the Expect: 100-continue header, the server will examine relevant details of the request. These might include the Content-Type or Content-Length header fields. If the server is willing to accept the message body then it will return the 100 Continue informational response.

If the server is unwilling to accept the message body then it can send an appropriate status, such as 401 Unauthorized or 405 Method Not Allowed. The 417 Expectation Failed error message is only returned when the server or response chain does not support expectations. Therefore, if this message is received then the client can resend the request without the Expect header.

Note

Search engines like Google will not index a URL with 417 Expectation Failed response status, and consequently, URLs that have been indexed in the past but are now returning this HTTP status code will be removed from the search results.

Special consideration for clients

A client that sends Expect: 100-continue is not required to wait for a specific length of time. Therefore, the client may proceed to transmit the message body without first receiving a response. Moreover, as HTTP/1.0 servers do not support expectations, in case one is being used as an intermediary, the client shall not wait an indefinite period before transmitting the message body.

Special consideration for servers

If a server receives the Expect: 100-continue as part of an HTTP/1.0 request, then it must be ignored. Also, the server does not have to acknowledge with a 100 Continue if the message body has already been received or if instead there is a determination made that there is no message body.

Also, when a server sends a 100 Continue response, it must ultimately send a final status such as 200 OK unless the connection is dropped beforehand.

Finally, if a server responds with the final response in advance of receiving the entire message body, it will indicate in the response what it intends to do in terms of the connection. Specifically, will it close the connection or continue reading and discard the request message.

Example

In the example, the client requests to send a 10K PDF file. The server responds with the 417 Expectation Failed error message because it does not support expectations.

Request

PUT /docs HTTP/1.1
Host: www.example.re
Content-Type: applications/pdf
Content-Length: 10000
Expect: 100-continue

Response

HTTP/1.1 417 Expectation Failed
Content-Type: text/html
Content-Length: 155

<html>
  <head>
    <title>Expectations not supported</title>
  </head>
  <body>
   <p>We don’t expect much, and neither should you.</p>
  </body>
</html>

Code references

.NET

HttpStatusCode.ExpectationFailed

Rust

http::StatusCode::EXPECTATION_FAILED

Rails

:expectation_failed

http.StatusExpectationFailed

Symfony

Response::HTTP_EXPECTATION_FAILED

Python3.5+

http.HTTPStatus.EXPECTATION_FAILED

Apache HttpComponents Core

org.apache.hc.core5.http.HttpStatus.SC_EXPECTATION_FAILED

Angular

@angular/common/http/HttpStatusCode.ExpectationFailed

Takeaway

The 417 Expectation Failed status code is a client error that is sent because the server does not support expectations, yet one was included with the request.

What Is 417 Http Status Code?

When a client sends an HTTP request, the server responds with an HTTP status code. The 417 status code is one of these codes of Hypertext Transfer Protocol (HTTP). This HTTP response indicates that the expectation set by the Expect header field in the request message was not met by the server due to exceeding predetermined timeouts or content length limitations indicated within a message body. Essentially, it means that something went wrong when attempting to fulfill a client’s request.

The 417 http status code is usually associated with incorrect usage of certain HTTP methods and headers, including GET and POST requests. It may also be caused by faulty syntax or inappropriate input parameters sent through the body of the message. In either case, this type of error generally occurs during communication between two web-based applications as opposed to end-user errors like 404 which are triggered by users entering invalid URLs into their browsers.

Cause Of 417 Http Status Code Error

When dealing with 417 HTTP status codes, it’s important to understand the cause of this error. By definition, a 417 is an ‘expectation failed’ response given by inbound servers when they do not receive the expected value from a request’s expect header field. This means that the expectation given was not met and as such could be caused by either server-side or client-side issues.

Some common causes of the 417 HTTP status code error include:

Unsupported “Expect” header field: The server may not support the “Expect” header field sent by the client, or the header field may contain an unsupported value.
Server configuration issues: The server may be misconfigured or may have a setting that prevents it from fulfilling the client’s request.
Network connectivity issues: The client may be experiencing network connectivity issues that prevent it from communicating properly with the server.
Request timeout: The client may have sent a request with an expectation that the server would respond within a certain amount of time, but the server failed to meet that expectation, resulting in a timeout.

Server Side Or Client Side Issue?

This type of issue can either reside on the client error or the server-side error. Depending on where the problem lies, different methods are required to resolve this issue.

If the cause of the 417 error is due to something on the server side, then it may require changes to how requests are processed and handled by your web server software before they reach their destination URL. It might also involve reconfiguring certain settings such as authentication protocols or other parameters associated with that particular request method.

On the other hand, if there appears to be a client-side issue at play, then resolving this error would likely involve inspecting any relevant headers sent along with each request and making sure they match what’s expected by your web application. Additionally, you should check for typos or invalid characters which could throw off the communication between your browser and server.

How To Fix 417 Http Status Code Error

When it comes to troubleshooting and resolving 417 HTTP status code errors, there are several steps you can take in order to fix the issue. This guide will help you identify what’s causing a 417 error on your website, as well as provide solutions for how to resolve it quickly and efficiently.

To fix the 417 HTTP status code error, also known as “Expectation Failed,” you can try the following solutions:

Remove the “Expect” header: If the server does not support the “Expect” header field sent by the client, removing this header from the request may resolve the issue.
Check server configuration: Ensure that the server is properly configured and able to fulfill the client’s request. Verify that any relevant settings or plugins are properly installed and configured.
Increase request timeout: If the server is taking too long to respond to the client’s request, you can try increasing the request timeout setting.
Check network connectivity: Ensure that the client’s network connectivity is stable and that it can properly communicate with the server. If necessary, you can try resetting your network connection or restarting your router.
Contact the website or server administrator: If none of the above solutions work, you may want to contact the website or server administrator to report the issue and seek further assistance.
Update or switch web browser: Sometimes, the browser may be the issue. Try updating your browser to the latest version, or try using a different browser to see if the issue persists.
Disable any firewalls or antivirus software temporarily: Sometimes, firewalls or antivirus software can interfere with the communication between the client and the server. Temporarily disable any firewalls or antivirus software and check if the issue persists.
Check for any proxy or VPN settings: If you are using a proxy server or VPN, check that the settings are correct and that they are not causing the issue. Try disabling any proxy or VPN settings temporarily and see if the issue is resolved.
Clear cache and cookies: Clearing your browser’s cache and cookies can sometimes help fix the issue.
Use a different internet connection: If you are still experiencing the issue, try using a different internet connection, such as switching from Wi-Fi to cellular data, or using a different Wi-Fi network.

All HTTP status codes by categories

Источник

From Wikipedia, the free encyclopedia

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

404 error on Wikimedia

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.

Explanatory notes

^ Emphasised words and phrases such as must and should represent interpretation guidelines as given by RFC 2119

References

^ ^a ^b ^c «Hypertext Transfer Protocol (HTTP) Status Code Registry». Iana.org. Archived from the original on December 11, 2011. Retrieved January 8, 2015.
^ Fielding, Roy T. «RFC 9110: HTTP Semantics and Content, Section 10.1.1 «Expect»«.
^ Goland, Yaronn; Whitehead, Jim; Faizi, Asad; Carter, Steve R.; Jensen, Del (February 1999). HTTP Extensions for Distributed Authoring – WEBDAV. IETF. doi:10.17487/RFC2518. RFC 2518. Retrieved October 24, 2009.
^ «102 Processing — HTTP MDN». 102 status code is deprecated
^ Oku, Kazuho (December 2017). An HTTP Status Code for Indicating Hints. IETF. doi:10.17487/RFC8297. RFC 8297. Retrieved December 20, 2017.
^ Stewart, Mark; djna. «Create request with POST, which response codes 200 or 201 and content». Stack Overflow. Archived from the original on October 11, 2016. Retrieved October 16, 2015.
^ «RFC 9110: HTTP Semantics and Content, Section 15.3.4».
^ «RFC 9110: HTTP Semantics and Content, Section 7.7».
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^ Delta encoding in HTTP. IETF. January 2002. doi:10.17487/RFC3229. RFC 3229. Retrieved February 25, 2011.
^ ^a ^b «RFC 9110: HTTP Semantics and Content, Section 15.4 «Redirection 3xx»«.
^ Berners-Lee, Tim; Fielding, Roy T.; Nielsen, Henrik Frystyk (May 1996). Hypertext Transfer Protocol – HTTP/1.0. IETF. doi:10.17487/RFC1945. RFC 1945. Retrieved October 24, 2009.
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^ I’m a teapot
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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

Источник

The expectation given in the request’s Expect header field¹ could not be met by at least one of the inbound servers.

¹ Expect RFC7231 Section 5.1.1
Source: RFC7231 Section 6.5.14

417 CODE REFERENCES

Rails HTTP Status Symbol :expectation_failed

Go HTTP Status Constant http.StatusExpectationFailed

Symfony HTTP Status Constant Response::HTTP_EXPECTATION_FAILED

Python2 HTTP Status Constant httplib.EXPECTATION_FAILED

Python3+ HTTP Status Constant http.client.EXPECTATION_FAILED

Python3.5+ HTTP Status Constant http.HTTPStatus.EXPECTATION_FAILED

When is a 417 status code used?

The HTTP 417 status code is used when a client specifies one or more conditions for proactive negotiation in the request’s Expect header.

The 417 Expectation Failed error code is only returned when the server or response chain does not support expectations. If the message is received, the client can resend the request with the Expect header.

It’s also related to the HTTP response 100 Continue. The server will examine relevant request details when a request is submitted through the Expect 100-continue header. The server will return the 100 Continue response if it accepts the message body.

If the server doesn’t accept the request, it can send the 401 Unauthorized or 405 Method Not Allowed status.

Status code 417 special considerations

There are a few special considerations that you should keep in mind when it comes to how servers and clients respond to 417 codes and 100 Continue headers.

Servers

Servers must ignore Expect: 100-continue header that is part of a HTTP/1.0 request. Servers also don’t need to acknowledge 100 Continue headers if it already received the message body.

Clients

Clients that send a Expect: 100-continue header does not need to wait for a required period of time. As a result, clients can transmit the message body without receiving a response first.

Will search engines index a URL with a 417 status code error?

No, search engines, like Google, will not index a URL with the HTTP 417 Expectation Failed error. As a result, URLs returning a 417 status error could experience a loss in search result rankings.

417 status code example

Want to see a 417 Expectation Failed response in action? Let’s take a look at an example.

In this example, a client requests to send a pdf article and the server responds with the 417 error.

Request

HTTP/1:1

Host: www.example.com

Content-type: pdf

Content-length: 5000

Expect: 100-continue

Response

HTTP/1:1 417 Expectation Failed

Content-type: Text

Content length: 100

<html>

<head>

<title> Expectations not supported </title>

<head>

<body>

<p> Can’t support your request </p>

<body>

</html>

Additional resources

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MDN Web Docs
W3Schools

Return to List of HTTP Status Codes

Источник

Код состояния HTTP 417 следует использовать, когда есть проблема со способностью сервера соответствовать требованиям поля заголовка запроса Expect.

Успешные ответы(200-299)Сообщения о перенаправлении(300-399)Ответы об ошибках клиента(400-499)Ответы об ошибках сервера(500-599 )

Заголовок HTTP-запроса Expect указывает на ожидания,которые должны быть выполнены сервером для успешной обработки запроса.На запрос Expect:100-continue,сервер отвечает:100 (Continue),если информации из заголовка запроса достаточно для немедленного успеха.

417 Ожидание не оправдалось

Код ответа об ошибке клиента HTTP 417 Expectation Failed указывает, что ожидание, указанное в заголовке Expect запроса, не может быть выполнено.

Смотрите заголовок Expect для более подробной информации.

Usage

Special consideration for clients

Special consideration for servers

Example

Code references

Takeaway

See also

What Is 417 Http Status Code?

Cause Of 417 Http Status Code Error

Server Side Or Client Side Issue?

How To Fix 417 Http Status Code Error

All HTTP status codes by categories

1xx informational response

2xx success

3xx redirection

4xx client errors

5xx server errors

Unofficial codes

Internet Information Services

nginx

Cloudflare

AWS Elastic Load Balancing

Caching warning codes (obsoleted)

See also

Explanatory notes

References

External links

417 CODE REFERENCES

When is a 417 status code used?

Status code 417 special considerations

Servers

Clients

Will search engines index a URL with a 417 status code error?

417 status code example

Request

Response

Additional resources

417 Ожидание не оправдалось

417 Ожидание не оправдалось

Status

Specifications

See also

HTTP

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