Maximum request length exceeded ошибка

asked Oct 4, 2010 at 8:48

If you are using IIS for hosting your application, then the default upload file size is 4MB. To increase it, please use this below section in your web.config —

<configuration>
    <system.web>
        <httpRuntime maxRequestLength="1048576" />
    </system.web>
</configuration>

For IIS7 and above, you also need to add the lines below:

 <system.webServer>
   <security>
      <requestFiltering>
         <requestLimits maxAllowedContentLength="1073741824" />
      </requestFiltering>
   </security>
 </system.webServer>

Note:

• maxRequestLength is measured in kilobytes
• maxAllowedContentLength is measured in bytes

which is why the values differ in this config example. (Both are equivalent to 1 GB.)

I don’t think it’s been mentioned here, but to get this working, I had to supply both of these values in the web.config:

In system.web

<httpRuntime maxRequestLength="1048576" executionTimeout="3600" />

And in system.webServer

<security>
    <requestFiltering>
        <requestLimits maxAllowedContentLength="1073741824" />
    </requestFiltering>
</security>

IMPORTANT : Both of these values must match. In this case, my max upload is 1024 megabytes.

maxRequestLength has 1048576 KILOBYTES, and maxAllowedContentLength has 1073741824 BYTES.

I know it’s obvious, but it’s easy to overlook.

It may be worth noting that you may want to limit this change to the URL you expect to be used for the upload rather then your entire site.

<location path="Documents/Upload">
  <system.web>
    <!-- 50MB in kilobytes, default is 4096 or 4MB-->
    <httpRuntime maxRequestLength="51200" />
  </system.web>
  <system.webServer>
    <security>
      <requestFiltering>
        <!-- 50MB in bytes, default is 30000000 or approx. 28.6102 Mb-->
        <requestLimits maxAllowedContentLength="52428800" /> 
      </requestFiltering>
    </security>
  </system.webServer>
</location>

answered May 6, 2013 at 16:57

And just in case someone’s looking for a way to handle this exception and show a meaningful explanation to the user (something like «You’re uploading a file that is too big»):

//Global.asax
private void Application_Error(object sender, EventArgs e)
{
    var ex = Server.GetLastError();
    var httpException = ex as HttpException ?? ex.InnerException as HttpException;
    if(httpException == null) return;

    if (((System.Web.HttpException)httpException.InnerException).WebEventCode == System.Web.Management.WebEventCodes.RuntimeErrorPostTooLarge)
    {
        //handle the error
        Response.Write("Too big a file, dude"); //for example
    }
}

(ASP.NET 4 or later required)

The maximum request size is, by default, 4MB (4096 KB)

This is explained here.

The above article also explains how to fix this issue

If you can’t update configuration files but control the code that handles file uploads use HttpContext.Current.Request.GetBufferlessInputStream(true).

The true value for disableMaxRequestLength parameter tells the framework to ignore configured request limits.

For detailed description visit https://msdn.microsoft.com/en-us/library/hh195568(v=vs.110).aspx

answered Aug 10, 2017 at 7:13

answered Oct 4, 2010 at 8:52

To summarize all the answers in a single place:

<system.web>
  <httpRuntime targetFramework="4.5.2" maxRequestLength="1048576"/>
</system.web>

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="1073741824" />
    </requestFiltering>
  </security>
</system.webServer>

Rules:

• maxRequestLength (expressed in kb) value must match
  maxAllowedContentLength (expressed in bytes).
• most of the time your system.web section may already contains an «httpRuntime». set your targetFramework to the version of your .net used.

Notes:

• default value for maxRequestLength is 4096 (4mb). max value is 2,147,483,647
• default value for maxAllowedContentLength is 30,000,000 (around 30mb). max value is 4,294,967,295

more info MSDN

answered Mar 21, 2018 at 17:46

answered Dec 4, 2015 at 9:07

answered Dec 31, 2015 at 3:13

answered Oct 19, 2015 at 23:15

Graham LaightGraham Laight

4,7003 gold badges30 silver badges28 bronze badges

I had to edit the C:\Windows\System32\inetsrv\config\applicationHost.config file and add <requestLimits maxAllowedContentLength="1073741824" /> to the end of the…

<configuration>
    <system.webServer>
        <security>
            <requestFiltering>

section.

As per This Microsoft Support Article

answered Jan 30, 2017 at 0:48

Nida AkramNida Akram

3422 gold badges9 silver badges25 bronze badges

I can add to config web uncompiled

<system.web> 
  <httpRuntime maxRequestLength="1024" executionTimeout="3600" /> 
  <compilation debug="true"/> 
</system.web> 
<security> 
  <requestFiltering> 
    <requestLimits maxAllowedContentLength="1048576"/> 
  </requestFiltering> 
</security>