Rest Api Arguments in in C#/ IIS seems too long

Question

I'm totally new in web development and I tried to create a simple rest api in vs2019/windows server 2016 for evaluation purpose.

My case/issue is as follows. I have a simple controller which has a 2 argument(string, string) method. If the whole request utf8 string is > 2101 characters the server returns a 404 in general.

I test this limitless time, with a dummy ("AAAAA.....") request string. 2002 length fails and 2001 length works. I tried to fix web.config but without luck, now I have a maxQueryStringLength exception.

Can anyone point me to the right direction?

would it make sense to put all your parameters in the URL, and why you are not trying to send your parameters using the body ? — sayah imad, Jan 19 '20 at 22:10
You're running up against an extreme case here. General guideline is that URLs shouldn't be longer than ~2000 characters because unexpected things start happening. There is a pretty good explanation [here](https://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers). — Bradford Dillon, Jan 20 '20 at 03:55

score 0 · Answer 1 · answered Jan 20 '20 at 08:11

In your site web.config, add the following configuration (modifying existing elements when they are present, otherwise adding new elements):

<system.webserver>
  <security> 
    <requestFiltering> 
      <requestLimits maxUrl="65535" maxQueryString="65535"/> 
    </requestFiltering> 
  </security> 
</system.webServer>

and

<system.web> 
  <httpRuntime maxRequestLength="65535" maxUrlLength="65535" maxQueryStringLength="65535" />
</system.web>

do not forget to restart the site or iis after doing changes.

Rest Api Arguments in in C#/ IIS seems too long

1 Answers1