chore: use httpdate to format expires

crates/volta-core/src/tool/node/resolve.rs

@@ -18,7 +18,7 @@ use attohttpc::header::HeaderMap;
 use attohttpc::Response;
 use cfg_if::cfg_if;
 use fs_utils::ensure_containing_dir_exists;
-use headers::{CacheControl, Expires, Header, HeaderMapExt};
+use headers::{CacheControl, Expires, HeaderMapExt};
 use log::debug;
 use node_semver::{Range, Version};
 
@@ -245,12 +245,9 @@ fn resolve_node_versions(url: &str) -> Fallible<RawNodeIndex> {
             let expiry = create_staging_file()?;
             let mut expiry_file: &File = expiry.as_file();
 
-            let mut header_values = Vec::with_capacity(1);
-            expires.encode(&mut header_values);
-            // Since we just `.encode()`d into `header_values
-            let encoded_expires = header_values.first().unwrap().to_str().unwrap();
+            let formatted_expires = httpdate::fmt_http_date(SystemTime::from(expires));
 
-            write!(expiry_file, "{}", encoded_expires).with_context(|| {
+            write!(expiry_file, "{}", formatted_expires).with_context(|| {
                 ErrorKind::WriteNodeIndexExpiryError {
                     file: expiry.path().to_path_buf(),
                 }