Fix #731

Author: yhirose

httplib.h

@@ -4738,7 +4738,7 @@ inline bool ClientImpl::read_response_line(Stream &strm, Response &res) {
   const static std::regex re("(HTTP/1\\.[01]) (\\d+) (.*?)\r\n");
 
   std::cmatch m;
-  if (!std::regex_match(line_reader.ptr(), m, re)) { return false; }
+  if (!std::regex_match(line_reader.ptr(), m, re)) { return true; }
   res.version = std::string(m[1]);
   res.status = std::stoi(std::string(m[2]));
   res.reason = std::string(m[3]);