How to configure the web config to allow requests of any length

Question

I am building a site in which i would like to create a file client side from the value of a textarea element   I have the code in place to do this  but i am getting this error     HTTP Error 404 15 - Not Found The request filtering module is   configured to deny a request where the query string is too long    Is there a way to override this so that I am able to process requests of any size   If not  is there a way to generate files client side without using the filesystem active x object   thanks

User · Answer

I had to add  AllowAnonymous  to the ActionResult functions in my login page because the user was not authenticated yet

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Add the following to your web config    lt system webServer gt     lt security gt       lt requestFiltering gt         lt requestLimits maxQueryString  32768   gt       lt  requestFiltering gt     lt  security gt   lt  system webServer gt    See   http   www iis net ConfigReference system webServer security requestFiltering requestLimits  Updated to reflect comments   requestLimits Element for requestFiltering  IIS Settings Schema   You may have to add the following in your web config as well   lt system web gt       lt httpRuntime maxQueryStringLength  32768  maxUrlLength  65536   gt   lt  system web gt    See  httpRuntime Element  ASP NET Settings Schema   Of course the numbers  32768 and 65536  in the config settings above are just examples   You don t have to use those exact values

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I had a similar issue trying to deploy an ASP Web Application to IIS 8  To fix it I did as Matt and Leniel suggested above  But also had to configure the Authentication setting of my site to enable Anonymous Authentication  And that Worked for me

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In my case   Visual Studio 2012   IIS Express   ASP NET MVC 4 app    Net Framework 4 5   what really worked after 30 minutes of trial and error was setting the maxQueryStringLength property in the  lt httpRuntime gt  tag    lt httpRuntime targetFramework  4 5  maxQueryStringLength  10240  enable  true    gt    maxQueryStringLength defaults to 2048   More about it here   Expanding the Range of Allowable URLs    I tried setting it in  lt system webServer gt  as  MattVarblow suggests  but it didn t work    and this is because I m using IIS Express  based on IIS 8  on my dev machine with Windows 8   When I deployed my app to the production environment  Windows Server 2008 R2 with IIS 7   IE 10 started returning 404 errors in AJAX requests with long query strings  Then I thought that the problem was related to the query string and tried  MattVarblow s answer  It just worked on IIS 7

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It will also  generate error when you pass large string in  ajax call parameter   so for that alway use type post in  ajax will resolve your issue 100   and no  need to set the length in web config       var UserId  array of 1000 userids    ajax           global  false          url  SitePath     User getAussizzMembersData            data     UserIds  UserId            type    POST            dataType    JSON

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If your website is using authentication  but you don t have the correct authentication method set up in IIS  e g  Basic  Forms etc    then the browser will be getting stuck in a redirect loop   This causes the redirect url to get longer and longer until it explodes

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Something else to check  if your site is using MVC  this can happen if you added  Authorize  to your login controller class  It can t access the login method because it s not authorized so it redirects to the login method --  boom

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If you run into this issue when running an IIS 8 5 web server you can use the following method   First  find the  Request Filtering  module in the IIS site you are working on  then double click it       Next  you need to right click in the white area shown below then click the context menu option called  Edit Feature Settings      Then the last thing to do is change the  Maximum query string  Bytes   value from 2048 to something more appropriate such as 5000 for your needs

User · Answer

HTTP Error 404 15 - Not Found The request filtering module is   configured to deny a request where the query string is too long    To resolve this problem  check in the source code whether the Form tag has a property method is get set state   If so  the method property should be removed

[c#] How to configure the web.config to allow requests of any length

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