server: remove std::terminate() in http thread

Remove std::terminate() in those 2 places:

Line 257 in 6ce863c

std::terminate(); // we cannot return here since the caller is HTTP code

Line 289 in 6ce863c

std::terminate(); // we cannot return here since the caller is HTTP code

They were there because we cannot return to the caller, which may cause deadlock.

The more appropriate solution here is to throw an specific exception that will be catched by ex_wrapper(), which will terminate the thread

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