On Thu, 2025-01-09 at 19:14 -0500, Sneha Murganoor wrote:
> Dear HttpClient Users,
>
> I am using an Apache HttpClient5 to make CONNECT requests through an
> HTTP
> tunneling forward proxy. I would like to measure the backend latency
> after
> the tunnel connection is established between the proxy and the target
> server.
>
> Specifically, is there a way to determine the duration between:
>
> 1. The proxy client establishing the tunnel connection with the
> target
> server, and
> 2. The client receiving the first byte of the response from the
> target
> server?
>
> Thank you for your assistance.
>
> Best regards,
> Sneha
Hi Sneha
I am not sure what you mean by the first byte of the response but I
presume the receipt of the response message head is what you actually
want.
This is one can introduce performance probes into the message
processing pipeline
```
HttpClients.custom()
.setRequestExecutor(new HttpRequestExecutor(
Http1Config.DEFAULT,
DefaultConnectionReuseStrategy.INSTANCE,
new Http1StreamListener() {
@Override
public void onRequestHead(final HttpConnection
connection, final HttpRequest request) {
System.out.println(request.getMethod() + " " +
request.getRequestUri() + " " + Instant.now());
}
@Override
public void onResponseHead(final HttpConnection
connection, final HttpResponse response) {
System.out.println(response.getCode() + " " +
Instant.now());
}
@Override
public void onExchangeComplete(final HttpConnection
connection, final boolean keepAlive) {
}
})).build();
```
This should give you access to both the proxy tunnel connection message
exchange and the request / response exchange with the target server.
Hope this helps
Oleg
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