Connection: keep-alive in Unity Web Request?

Hello,

We make dozens of API calls in a single game session so doing a new TCP handshake on each request is reducing our performance terribly. We wanted to see if there's any way that we could do to set Connection header to keep-alive on Unity. I'm aware of this though;

"These headers cannot be set with custom values on any platform: accept-charset, access-control-request-headers, access-control-request-method, connection, date, dnt, expect, host, keep-alive, origin, referer, te, trailer, transfer-encoding, upgrade, via."

But we need it terribly because each TCP(+SSL) handshake takes from 300 ms - 12,000 ms
And a collegaue of mine told something about Unity Pro may have an advantage of this as access to lower level code.

And I'd like to ask if there's anyone having issues with TCP Handshake failures (SSL) on Unitywebrequest with iOS/Android.

Thanks, have a nice day.

 

Our Unity version is 2019.1.4f1

 

Upgraded to 2019.2 but still getting "InvalidOperationException: Cannot override system-specified headers"

 

Is there anything special I need to do to get keep alive connections to work? Does it matter if I make this request from a singleton (which doesn't get destroyed between scene changes).

UnityWebRequest www = UnityWebRequest.Post(url, "");

Or do I have to keep an instance to the web request somehow alive, in an instance variable for example?

Now I don't see any keep alive requests at the server.

 

Hi,

When I try to send request with UnityWebRequest, on 2019.1 it doesn't reuse the connection. But for 2019.2 or later it obey the keep-alive. I'm debugging with Wireshark for my iPhone. This is a huge issue because of ssl handshake it'll cost too much data out on AWS on our backend.

How can I enable keep alive for all unity versions (2018 and later) or is there specific unity version keep alive started to be supported ?

Thanks

 

Thanks, is there any alternative way we can use for older Unity versions ? Or do we need to implement native plugins for each platform to utilize keep alive ?