Check for .json extension in a non-allocating way

Co-authored-by: Joshua Nelson <[email protected]>

Author: coolshaurya

src/web/builds.rs

@@ -43,7 +43,7 @@ pub fn build_list_handler(req: &mut Request) -> IronResult<Response> {
     let mut conn = extension!(req, Pool).get()?;
     let limits = ctry!(req, Limits::for_crate(&mut conn, name));
 
-    let is_json = req.url.path().join("/").ends_with(".json");
+    let is_json = req.url.path().last().map_or(false, |segment| segment.ends_with(".json"));
 
     let version =
         match match_version(&mut conn, name, req_version).and_then(|m| m.assume_exact())? {