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

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Add the following to your web.config:

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxQueryString="32768"/>
    </requestFiltering>
  </security>
</system.webServer>

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

<system.web>
    <httpRuntime maxQueryStringLength="32768" maxUrlLength="65536"/>
</system.web>

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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