On Sun, 23 Jan 2022, 白水月 wrote:
What I was doing is to send keepalive requests to the server. I'm just
wondering if there is a more graceful solution.
TCP keepalive is rarely enough to maintain a connection. It usually also
requires actual TCP traffic to go over it, which in the HTTP/2 case could be
PING frames like with curl_easy_upkeep(). Sometimes it will also require HTTP
requests to prevent the server from killing connections for being idle.
If you're using HTTP/1 you instead can do "no-op" HTTP requests, such as HEAD
or OPTIONS.
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