Log Message:
cpp-httplib: update to 0.18.5.

0.18.5

Bug fixes and new feature Latest

    Port/Address re-use #2011
    Invalid Content-Length values should be rejected #2014
    Feature request: ability to check if the connection is still alive #2017

0.18.4

Bug fixes

    Changed to use non-blocking socket in is_ssl_peer_could_be_closed (258992a)
    Treat out-of-range last_pos as the end of the content #2009
    fix:set_file_content with range request return 416. #2010
    Fix HTTP Response Splitting Vulnerability (9c36aae)