Downloading the binaries through a proxy if either HTTPS_PROXY or HTT…

…P_PROXY environment variable is set.

closes #48

Cargo.toml

@@ -18,7 +18,7 @@ home = "0.5.3"  # use same ver in build-dep
 env_logger = "0.8"
 
 [build-dependencies]
-ureq = "1.0"  # allows to keep MSRV 1.41.1
+ureq = "2.1"
 bitcoin_hashes = "0.10"
 flate2 = "1.0"
 tar = "0.4"

build.rs

@@ -73,8 +73,18 @@ fn main() {
         );
         let mut downloaded_bytes = Vec::new();
 
-        let _size = ureq::get(&url)
+        let http_proxy = std::env::var("HTTPS_PROXY").or_else(|_| std::env::var("HTTP_PROXY"));
+        let agent = if let Ok(proxy) = http_proxy {
+            let proxy = ureq::Proxy::new(proxy).unwrap();
+            ureq::AgentBuilder::new().proxy(proxy).build()
+        } else {
+            ureq::AgentBuilder::new().build()
+        };
+
+        let _size = agent
+            .get(&url)
             .call()
+            .unwrap()
             .into_reader()
             .read_to_end(&mut downloaded_bytes)
             .unwrap();