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Does anyone know if there is a way of catching this error?
Essentially I'm trying to implement some functionality to allow a user to upload a file from a webpage to a webapi controller.
This works fine, but if the file size exceeds the maximum size specified in the web.config the server returns a 404 error.
I want to be able to intercept this and return a 500 error along with message which can be consumed by the client.
I can't work out where to do this in WebApi as the Application_Error method I've implemented in Global.asax is never hit and it seems like IIS is not passing this through to the WebApi application.
684
Large file uploads in ASP.NET The default maximum filesize is 4MB - this is done to prevent denial of service attacks in which an attacker submitted one or more huge files which overwhelmed server resources. If a user uploads a file larger than 4MB, they'll get an error message: "Maximum request length exceeded."
The MaxRequestLength property specifies the limit for the buffering threshold of the input stream. For example, this limit can be used to prevent denial of service attacks that are caused by users who post large files to the server.
HttpRuntime maxRequestLength Use the maxRequestLength of the httpRuntime element. The default size is 4096 kilobytes (4 MB). Max value 2,147,483,647 kilobytes (~82 Terabyte).
Try to set IIS to accept 2GB requests(in Bytes).
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="2147483648" /> // 2GB
</requestFiltering>
</security>
</system.webServer>
And set reasonable request size for ASP.NET app(in kiloBytes).
<system.web>
<httpRuntime maxRequestLength="4096" /> // 4MB (default)
</system.web>
Now IIS should let requests less than 2GB pass to your app, but app will jump into Application_Error reaching 4MB request size. There you can manage what you want to return.
Anyway, requests greater than 2GB will always return 404.13 by IIS.
Related links:
Dealing with large files in ASP.NET Web API
145
How it looks like on my server:
<system.web>
<httpRuntime targetFramework="4.6.1" maxRequestLength="16240" />
</system.web>
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