ASP.NET MVC returning more than expected

Question

In my code, when a certain exception happens, im returning

Response.AddHeader("X-Status", "çãõáéí");
Response.Charset = "utf-8";
Response.HeaderEncoding = Encoding.UTF8;
return new HttpStatusCodeResult(403, "You lack permission X, Y and Z");

and using Postman I was surprised to see 3 things:

the body of the response. it should be empty.. the response should contain only headers, but the body is actually full of html/css...
the Content-Type header was only "text/html" and not "text/html charset=utf-8"
there was nothing indicating that "Response.HeaderEncoding" was set... whether it was set to utf8 or utf32 or big-indian...

So, how can I "make" the body empty? meaning that I wish the content of the response to be clear... Extra points if you are able to teach me to encode X-Status so the browser displays especial chars correctly and not like a upside down question mark...

In testing your code in a blank project, it looks like you're getting the IIS error page for 403. Still looking for a solution, but I'm not sure how you bypass those error pages. — Tieson T.
– Tieson T., Commented Oct 8, 2015 at 18:51

Tieson T. · Accepted Answer · 2015-10-08 19:05:22Z

4

It didn't seem obvious, but in order to bypass the IIS errors, you need to do something like:

<system.webServer>
  <httpErrors errorMode="Custom" existingResponse="Auto">
    <remove statusCode="403" />
  </httpErrors>
</system.webServer>

Essentially, you need to override/remove the default handler for the error code you're returning (in this case, Forbidden/403). Otherwise, your 403 response will trigger IIS's error handling and you get:

which is self-explanatory, I think.

This does introduce another problem: this is site-wide. It might be possible to handle the response code on a per-action basis (possibly with a filter, though that may be too far into the pipeline), but I'm not sure at this point.

answered Oct 8, 2015 at 19:05

Tieson T.

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