First commit. Incomplete example iron-gcd.

.gitignore

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+
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+# End of https://www.gitignore.io/api/rust,macos,jetbrains+all

gcd/Cargo.toml

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+[package]
+name = "gcd"
+version = "0.1.0"
+authors = ["Timothy Warren <tim@timshomepage.net>"]
+edition = "2018"
+
+[dependencies]

gcd/src/lib.rs

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+pub fn gcd(mut n: u64, mut m: u64) -> u64 {
+    assert!(n != 0 && m != 0);
+
+    while m != 0 {
+        if m < n {
+            let t = m;
+            m = n;
+            n = t;
+        }
+        m = m % n;
+    }
+
+    n
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_gcd() {
+        assert_eq!(gcd(14, 15), 1);
+
+        assert_eq!(
+            gcd(
+                2 * 3 * 5 * 11 * 17,
+                3 * 7 * 11 * 13 * 19
+            ),
+            3 * 11
+        )
+    }
+}

gcd/src/main.rs

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+use gcd::gcd;
+
+use std::io::Write;
+use std::str::FromStr;
+
+fn main() {
+    let mut numbers = Vec::new();
+
+    for arg in std::env::args().skip(1) {
+        numbers.push(
+            u64::from_str(&arg).expect("error parsing argument")
+        );
+    }
+
+    if numbers.len() == 0 {
+        writeln!(std::io::stderr(), "Usage: gcd NUMBER ...").unwrap();
+        std::process::exit(1);
+    }
+
+    let mut d = numbers[0];
+    for m in &numbers[1..] {
+        d = gcd(d, *m);
+    }
+
+    println!("The greatest common divisor of {:?} is {}", numbers, d);
+}

iron-gcd/Cargo.toml

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+[package]
+name = "iron-gcd"
+version = "0.1.0"
+authors = ["Timothy Warren <tim@timshomepage.net>"]
+edition = "2018"
+
+[dependencies]
+iron = "0.5.1"
+mime = "0.2.3"
+router = "0.5.1"
+urlencoded = "0.5.0"

iron-gcd/src/main.rs

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+extern crate iron;
+extern crate router;
+#[macro_use] extern crate mime;
+
+use iron::prelude::*;
+use iron::status;
+use router::Router;
+
+fn main() {
+    println!("Serving on http://localhost:3000...");
+
+    Iron::new(get_form).http("localhost:3000").unwrap();
+}
+
+fn get_form(_request: &mut Request) -> IronResult<Response> {
+    let mut response = Response::new();
+
+    response.set_mut(status::Ok);
+    response.set_mut(mime!(Text/Html; Charset=Utf8));
+    response.set_mut(r#"
+        <title>GCD Calculator</title>
+        <form action="/gcd" method="post">
+            <input type="number" min="0" name="n" />
+            <input type="number" min="0" name="m" />
+            <button type="submit">Compute GCD</button>
+        </form>
+    "#);
+
+    Ok(response)
+}