Fix type annotation error

src/cache/age.rs

@@ -62,7 +62,7 @@ impl Age {
         // entry. We want the last entry.
         let header = headers.iter().last().unwrap();
 
-        let num: u64 = header.as_str().parse().status(400)?;
+        let num: u64 = header.as_str().parse::<u64>().status(400)?;
         let dur = Duration::from_secs_f64(num as f64);
 
         Ok(Some(Self { dur }))

src/cache/cache_control/cache_directive.rs

@@ -94,7 +94,7 @@ impl CacheDirective {
 
         let mut get_dur = || -> crate::Result<Duration> {
             let dur = parts.next().status(400)?;
-            let dur: u64 = dur.parse().status(400)?;
+            let dur: u64 = dur.parse::<u64>().status(400)?;
             Ok(Duration::new(dur, 0))
         };
 
@@ -112,7 +112,7 @@ impl CacheDirective {
             "max-age" => Some(MaxAge(get_dur()?)),
             "max-stale" => match parts.next() {
                 Some(secs) => {
-                    let dur: u64 = secs.parse().status(400)?;
+                    let dur: u64 = secs.parse::<u64>().status(400)?;
                     Some(MaxStale(Some(Duration::new(dur, 0))))
                 }
                 None => Some(MaxStale(None)),

src/content/content_length.rs

@@ -47,7 +47,7 @@ impl ContentLength {
         // If we successfully parsed the header then there's always at least one
         // entry. We want the last entry.
         let value = headers.iter().last().unwrap();
-        let length = value.as_str().trim().parse().status(400)?;
+        let length = value.as_str().trim().parse::<u64>().status(400)?;
         Ok(Some(Self { length }))
     }