How do I increase the maxUrlLength property in the config in asp.net MVC 3?

Question

I am getting this error:

The length of the URL for this request exceeds the configured maxUrlLength value.

Looking around the closest thing I can find is in the web.config,

<requestFiltering>
   <requestLimits maxUrl="xxx">
</requestFiltering>

However this is not MaxUrlLength nor does it resolve the issue. Any ideas how to fix?

it's not "Related", you are posing the link to this same page — Toolkit, May 16 '19 at 05:08
I gave up - it is impossible to send over 260 chars after the `/`, thanks MS — Toolkit, May 16 '19 at 05:10

score 86 · Accepted Answer · answered Nov 23 '11 at 18:25

86

As per Ashok's answer that would equate to:

<httpRuntime maxUrlLength="1024" relaxedUrlToFileSystemMapping="true"/>

within <system.web> section of the web.config.

answered Nov 23 '11 at 18:25

Jesse

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Just as an addendum, the maximum possible value is 209715 – Hugo Nava Kopp Mar 07 '17 at 17:17
4

The default value is 260. – nmit026 Apr 10 '17 at 21:44
Where do you guys find the documentation to all this? I can't find anything in MSDN and Google only shows old links to .NET Framework 1.1d ocs – Leo Nov 09 '18 at 09:28
that's not enough, I still get `Bad Request - Invalid URL HTTP Error 400. The request URL is invalid.` when the string after `/` is longer than 260 – Toolkit May 16 '19 at 05:05

score 10 · Answer 2 · edited Dec 05 '16 at 19:02

10

Take a look at this post by Hanselman. Although this post is about accepting typically invalid characters in the URL he also mentions how to configure the length of the path and the query string

While we're in here, note that in ASP.NET 4 you can also change allowed path and queryString lengths:
<httpRuntime maxRequestPathLength="260" maxQueryStringLength="2048" />

edited Dec 05 '16 at 19:02

Matthew Haugen

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answered Nov 23 '11 at 19:36

Hector Correa

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His post seems to be incorrect - it is "maxRequestLength" not "maxRequestPathLength" – Anthony Jan 10 '13 at 22:30
@Anthony maxRequestLength also refers to the size of the request payload, which has a default of 4096 – fusi Aug 08 '16 at 09:34

score 6 · Answer 3 · answered Aug 02 '13 at 20:49

I had this problem in a rest service I created using C# .net 4. I set the maxUrlLength variable, in the system.web section, of the Web.Config file.

<?xml version="1.0"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.0" />
    <httpRuntime maxUrlLength="2000"/>
  </system.web>
....

score 3 · Answer 4 · answered Nov 23 '11 at 17:15

3

have you seen this msdn article that seems to what you need

answered Nov 23 '11 at 17:15

Ashok Padmanabhan

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user3594326 · Answer 5 · 2014-05-02T06:40:46.087

0

Having the same problem in IIS8, the solution was to modify the root Web.config for the .NET Framework. This file is located in %windir%\Microsoft.NET\Framework\framework_version\CONFIG. Editing the web.config file in the site root did not resolve the issue.

edited May 02 '14 at 06:40

answered May 01 '14 at 21:49

user3594326

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why would you repeat a 2 year old accepted answer almost verbatim? – Daniel E. May 01 '14 at 22:11
The point was a perceived difference in IIS8 and explicitly stating which web.config file needed editing. Yes the rest is superfluous. I'll edit this. – user3594326 May 02 '14 at 06:39
1

I see this same behavior with IIS7. Config setting doesn't seem to have any affect in website web.config, needs to be in .Net Framework web.config. FYI, for long MVC4 api urls, in the website web.config, I also needed to add this system.webServer > requestFiltering > requestLimits > maxUrl / maxQueryString setting you can see here [link](http://stackoverflow.com/questions/12564308/404-errors-when-calling-an-asp-net-mvc-3-controller-with-an-big-url-list/12564863#12564863) – Dudeman3000 Aug 19 '14 at 15:32

score 0 · Answer 6 · answered Feb 05 '20 at 17:51

In my case, I edited the setting visually in the IIS application (Request Filtering area):

This action modified my web.config as follows:

<security>
  <requestFiltering>
    <requestLimits maxAllowedContentLength="524288000" maxQueryString="4096" />
  </requestFiltering>
</security>

As was mentioned in some of the other answers, be sure to also consider long query strings in the request.

How do I increase the maxUrlLength property in the config in asp.net MVC 3?

6 Answers6

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