Very slow first client request

[BismuthGlass]

Hello,

First the context: using windows, and the blocking API. The test is done against a locally hosted server.

I have noticed that the first request done through a client is always very slow (upwards of 300ms). For instance, these instructions:

let client = reqwest::blocking::Client::builder()
    .build()
    .unwrap();
client.get("http://localhost:6880/res1.css").send().unwrap();

take about 320ms, and this time is roughly maintained even if I add extra send()s:

let client = reqwest::blocking::Client::builder()
    .build()
    .unwrap();
client.get("http://localhost:6880/res1.css").send().unwrap();
client.get("http://localhost:6880/res2.css").send().unwrap();
client.get("http://localhost:6880/res3.css").send().unwrap();

with each subsequent get(...).send() after the first taking around 1-3ms each, which is the time I would expect.

My question is simple: why does this happen, and what can I do to fix it? At first I thought it might be a problem with TLS, so I attempted to disable it by specifying default-features = false, but this didn't seem to help at all.

[mohe2015]

What kind of local server are you using and is the same behavior occurring with e.g. curl or something?

[BismuthGlass]

I am using a rocket based server, and queries to the same resources from firefox take about 3ms to complete on a new incognito tab (so no persistent sockets or anything of the sort, as far as I am aware.)

[BismuthGlass]

After testing with curl it seems this issue is indeed a Rocket issue and not a reqwest issue. My apologies.