lint: fix clippy warnings

src/body.rs

@@ -283,7 +283,7 @@ impl Body {
     pub async fn into_json<T: DeserializeOwned>(mut self) -> crate::Result<T> {
         let mut buf = Vec::with_capacity(1024);
         self.read_to_end(&mut buf).await?;
-        Ok(serde_json::from_slice(&buf).status(StatusCode::UnprocessableEntity)?)
+        serde_json::from_slice(&buf).status(StatusCode::UnprocessableEntity)
     }
 
     /// Creates a `Body` from a type, serializing it using form encoding.
@@ -356,7 +356,7 @@ impl Body {
     #[cfg(feature = "serde")]
     pub async fn into_form<T: DeserializeOwned>(self) -> crate::Result<T> {
         let s = self.into_string().await?;
-        Ok(serde_urlencoded::from_str(&s).status(StatusCode::UnprocessableEntity)?)
+        serde_urlencoded::from_str(&s).status(StatusCode::UnprocessableEntity)
     }
 
     /// Create a `Body` from a file named by a path.
@@ -630,7 +630,7 @@ async fn peek_mime(file: &mut async_std::fs::File) -> io::Result<Option<Mime>> {
 /// This is useful for plain-text formats such as HTML and CSS.
 #[cfg(all(feature = "fs", not(target_os = "unknown")))]
 fn guess_ext(path: &std::path::Path) -> Option<Mime> {
-    let ext = path.extension().map(|p| p.to_str()).flatten();
+    let ext = path.extension().and_then(|p| p.to_str());
     ext.and_then(Mime::from_extension)
 }
 

src/method.rs

@@ -398,7 +398,7 @@ mod serde {
         where
             S: Serializer,
         {
-            serializer.serialize_str(&self.to_string())
+            serializer.serialize_str(self.as_ref())
         }
     }
 }

src/mime/parse.rs

@@ -153,12 +153,12 @@ fn is_http_whitespace_char(c: char) -> bool {
 
 /// [code point sequence collection](https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points)
 fn collect_code_point_sequence_char(input: &str, delimiter: char) -> (&str, &str) {
-    input.split_at(input.find(delimiter).unwrap_or_else(|| input.len()))
+    input.split_at(input.find(delimiter).unwrap_or(input.len()))
 }
 
 /// [code point sequence collection](https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points)
 fn collect_code_point_sequence_slice<'a>(input: &'a str, delimiter: &[char]) -> (&'a str, &'a str) {
-    input.split_at(input.find(delimiter).unwrap_or_else(|| input.len()))
+    input.split_at(input.find(delimiter).unwrap_or(input.len()))
 }
 
 /// [HTTP quoted string collection](https://fetch.spec.whatwg.org/#collect-an-http-quoted-string)

src/security/strict_transport_security.rs

@@ -116,7 +116,7 @@ impl StrictTransportSecurity {
             } else if s == "preload" {
                 preload = true;
             } else {
-                let (key, value) = match s.split_once("=") {
+                let (key, value) = match s.split_once('=') {
                     Some(kv) => kv,
                     None => continue, // We don't recognize the directive, continue.
                 };

src/version.rs

@@ -31,7 +31,7 @@ mod serde {
         where
             S: Serializer,
         {
-            serializer.serialize_str(&self.to_string())
+            serializer.serialize_str(self.as_ref())
         }
     }