Recreating reqwest::Client forces tcp connection to be established each time.

[ssankko]

Hello!

I have remote server on the other side of the globe. Simple (first) postman request to this server takes around 600ms to complete, including dns lookup and tcp handshakes.

Consecutive requests use cached dns and handshakes, so one request takes around 160ms.

Though, when i send identical request to localhost reverse proxy each request takes around 330ms. I guess establishing new connection each request takes its toll.

Using already existing reqwest::Client cuts time in half, resulting in around 162ms.

I propose maybe use one Client, created lazily with lazy_static.

[danielSanchezQ]

Thanks! @ssankko, That sounds like a good improvement. I'll implement.
Would you mind doing some performance testing with the branch once done?

[danielSanchezQ]

You can test it know from the branch in this PR

[ssankko]

@danielSanchezQ I tested it, and it sure did speed up consecutive requests!
Thanks!