How to calculate proxy latency when sending an HTTP request?

Technical Discussion
1

As you all know we can easily get duration details of an HTTP request by using ClientTrace. Like DNS time, TTFB, etc. But what if I use a proxy server while sending the request? As far as I know, ClientTrace does not have a hook for calculating the proxy server latency. Is there any other way to eliminate proxy server latency from the total request duration?

What I want to achieve;

Life cycle without proxy;

Client --- request_duration --->  Server
Client <-- response_duration ---  Server

Life cycle with a proxy;

Client --- request_proxy_latency  ---> Proxy --- request_duration --->  Server
Client <-- response_proxy_latency ---- Proxy <-- response_duration ---  Server

In both cases above I want to calculate only request_duration + response_duration.

2

I think you could just calcute the time on the client end.
For example, Pseudocode might look like this

start:=time.Now()
request.get();
end:=time.Now();

so the (end-start) will contain request_duration+response_duration

3

Looks like there is no way to extract the latency of the proxy.

4

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