iisnode and custom http errors

[rnikitin]

Hi, we are building a REST API and we want to return any error and fault HTTP state with JSON body, contains error description. And we are deploying to Windows Azure WebSites.

Example code:

app.get("/error1", function(req, res){
    res.json(503, {desc: "something went wrong.", errcode: 1101});
});

We discovered, that iisnode handles this errors and rewrites the body.
Is there a way to prevent it from doing this?

[rnikitin]

Guys, any suggestions? @tjanczuk?

[spanditcaa]

Here's what we use:

web.config:

  <configuration>
    <system.web>
      <customErrors mode="off" />
    </system.web>
    <system.webServer>
      <httpErrors existingResponse="passthrough" />

   ...

then in a startup command -

%windir%\system32\inetsrv\appcmd delete module CustomErrorModule

[tjanczuk]

+1. This is actually IIS behavior, not iisnodes. Turning off IIS custom errors and setting the passthrough for the body should be sufficient.

[rnikitin]

Thanks, guys! This works very well even without deleting CustomErrorModule.
Could we put this somewhere in the wiki?

[pcomerford]

So, in case anyone out there is applying the <httpErrors existingResponse="passthrough" /> fix, be sure to try <httpErrors existingResponse="PassThrough" /> as well.