Java: Pass along any http error from server

[esoekianto]

• add logic to check if response code is 400 or above, getErrorStream, otherwise getInputStream
• check and serve gzip content encoding
• make sure to set error status code in the response

[bsvensson]

This fixes the 404, but makes it worse for f=oops where it now returns 200 (instead of expected 400) with a binary looking response (php has same problem, but DotNet works fine).

I'm using stand-alone Tomcat 8.0.3 (without apache httpd).

[bsvensson]

For the f=oops case, the browser is showing the gzipped content without telling the browser that it is gzipped (and thus need unzipping):

// Missing header to make it work
Content-Encoding:gzip

[esoekianto]

@bsvensson thank you!

[esoekianto]

@bsvensson no, we don't. My bad!

[bsvensson]

@esoekianto Also, should we change the German "nachricht" to English? Maybe "message"?

[esoekianto]

@bsvensson done

[bsvensson]

@esoekianto : Is the unzip-then-rezip necessary?

[esoekianto]

@bsvensson you are right, I'm re-writing this whole method now.