Adds a header to a list of existing headers.
@param headers the evkeyvalq object to which to add a header @param key the name of the header @param value the value belonging to the header @returns 0 on success, -1 otherwise. @see evhttp_find_header(), evhttp_clear_headers()
See Implementation
Adds a header to a list of existing headers.
@param headers the evkeyvalq object to which to add a header @param key the name of the header @param value the value belonging to the header @returns 0 on success, -1 otherwise. @see evhttp_find_header(), evhttp_clear_headers()