Cargo.toml

[package]
name = "failrequest"
version = "0.1.0"
authors = ["e00E"]

[dependencies]
reqwest = { git = "https://github.com/seanmonstar/reqwest.git" }

main.rs

extern crate reqwest;

const URL: &str = "https://httpbin.org/post";
// uncomment (and comment above) to test http instead of https
// const URL: &str = "http://httpbin.org/post";

fn test_in_memory() {
	let body_sizes = &[1usize, 10, 50, 100, 200, 1000];
	for &size in body_sizes {
		println!("Uploading from memory {}KB", size);
		let mut body = Vec::new();
		body.resize(size * 1024, 0u8);
		let client = reqwest::Client::builder().unwrap()
			.gzip(false)
			.build().unwrap();
		let response = client.post(URL).unwrap()
			.body(body)
			.send().unwrap();
		println!("{}", response.status());
	}
}

fn test_with_files() {
	// Create the files first with: for i in 1 10 50 100 200 1000; do dd if=/dev/zero of=${i}KB bs=${i}K count=1; done
	let filenames = &["1KB", "10KB", "50KB", "100KB", "200KB", "1000KB"];
	for filename in filenames {
		println!("Uploading from file {}", filename);
		let client = reqwest::Client::builder().unwrap()
			.gzip(false) // Does not actually change the outcome but I wanted to make sure the body is not altered
			// Uncomment to test with Fiddler as proxy on windows
			// .proxy(reqwest::Proxy::https("http://localhost:8888").unwrap())
			.build().unwrap();
		let response = client.post(URL).unwrap()
			.body(std::fs::File::open(filename).unwrap())
			.send().unwrap();
		println!("{}", response.status());
	}
}

fn main() {
	// Never fails (always status code 200)
	test_in_memory();
	println!();
	// Usually fails starting at 100KB or 200KB on windows
	// "fails" means the request "hangs" (it does not finish in the time it should) and
	// after a while httpbin returns status code 499 likely because we did not correctly send the request
	// Does not fail on windows when http instead of https is used for httpbin 
	// Does not fail on windows when Fiddler is used to intercept the https traffic
	// Does not matter if run in release mode or not
	//
	// Does not fail on linux
	test_with_files();
}