Traffic Ops HTTP response write errors are ignored

[rawlinp]

I'm submitting a ...

• bug report

Traffic Control components affected ...

• Traffic Ops

Current behavior:

Most of the functions that write HTTP responses in TO ignore write errors, like this one for example. This means that if there are any errors writing HTTP responses (due to e.g. hitting timeouts), we are mostly blind to them currently.

Expected behavior:

TO should log warnings if any errors occur when writing HTTP responses.

Minimal reproduction of the problem with instructions:

Since the current behavior is invisible, you're just going to have to look at the code and trust me on this.