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The problem has been solved. Thank you for your support.@eskimo @meaton
By reusing the nsurlsession, I can see the same Session ID in ServerHello.
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We used in UNNotificationServiceExtension ,code like ：
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
self->uploadTask = [[NSURLSession sessionWithConfiguration:config
delegate:self
delegateQueue:[NSOperationQueue currentQueue]] dataTaskWithRequest:request];
[self->uploadTask resume];
Through Wireshark packet capturing, We found that each request for Session ID is different：
Handshake Protocol: Server Hello
Session ID: 825a5a052f3c90115e2e7aab61b32858d53ec361111ddaaa70fcc55c53fab014
Session ID: 16aff82cdc84c8698847d97616cf7a1ac5267eb625707b2aed75e67a6cfd0a1a
How to keep Session ID constant? @eskimo @meaton
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If TLS 1.2 also has this, how to explain it?
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“cached certificates” means “Server Hello” package here. We are trying bandwidth optimization. Want to reduce the traffic occupied by “Server Hello” package, or other ways to reduce bandwidth
.
On the Android client, the second short interval request for “Server Hello” package will be smaller, so there is a problem with the method of narrowing the “Server Hello” package ，because the package size will not change during IOS testing.
