On Fri, 13 Nov 2020, Alen Loncaric wrote:

So what the lib is missing is here you have a shared object but use only
SSL ticket
Or having an option on curl object to do something like
easy_close_current_connection(curl obj)

I don't think I still quite understand what you're asking for, but I also suspect it doesn't matter too much! =)

Also this would be ok as if we leave maxage to 118sec and use connection cache, the connection does not get closed until next curl operation is done, which can be 1 hour away.

Why does this matter? A connection that is left (unused) in the connection cache for longer than maxage seconds will not be considered for reuse but yes it will remain there until curl has a reason to traverse the pool again. And then it will be killed off if determined too old.

And my understanding is that this max age connection will not disconnect as there is no housekeeping after the 118s, meaning that we will be connected to the server until next operation.

If nothing closes the connection, it will remain open indeed. But libcurl will never use it again.

So for this reasons something like easy_close_current_connection(curl obj) would be perfect. Or adding a function check for max age connections, which we can manually call to do housekeeping.

Why is it a concern for you if curl doesn't kill the connection sooner? It feel like you are putting a little more meaning into having that connection than what seems reasonable.

And regarding a function check for maxage connections, we could probably consider adding such a check to curl_easy_upkeep(). To me that seems like it would be within its realms and not too much of a stretch.

We've also had this entry in the TODO for a while already:

  https://curl.se/docs/todo.html#Offer_API_to_flush_the_connectio

p.s. also extracting SSL session and loading it into shared object would come in handy...

I believe that's an even older TODO entry:

  https://curl.se/docs/todo.html#Export_session_ids

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