Create an error response body outside render_error (issue #144)

[jimvm]

In l7 the resource and encodings_provided? is available so encode_body can be used. In this case the standard error response would have to be created outside of render_error though.

This works for gzip but not for deflate...

[seancribbs]

I think the better solution would be to have render_error properly set the headers. If that means clearing the selected encoding, that would be preferable to reporting the content-length incorrectly.

[jimvm]

I guess I did not understand that correctly.

So the Content-Encoding header should be cleared because the Content-Length header can't be changed there. Even if encodings_provided is set, in case of a 404 Content-Encoding should be clear.

[seancribbs]

@jimvm I was merely suggesting the most expedient solution, not a hard-and-fast one. Basically, regardless of what the response returns, the content-length needs to take into account the content-encoding, or we're in a lot of trouble.