empty request header values return HTTP 400

[nilsnolde]

already communicated, but leaving it here for posterity:

if a particular header has an empty value, we're currently failing the request. likely the culprit is here:

prime_server/src/http_protocol.cpp

Lines 462 to 466 in 4508553

	size_t field_end, value_begin;
	if ((field_end = partial_buffer.find(':')) == std::string::npos ||
	(value_begin = partial_buffer.find_first_not_of(' ', field_end + 1)) ==
	std::string::npos)
	throw RESPONSE_400;

.

not a nice behavior of a client either (QGIS in my case), but apparently the spec allows it..

once fixed, wdyt about a new release @kevinkreiser ?

[nilsnolde]

solved in #139