Fix new clippy lints (#561)

src/lib.rs

@@ -6,6 +6,8 @@
 #![allow(clippy::match_like_matches_macro)]
 // we're not changing public api due to a lint.
 #![allow(clippy::upper_case_acronyms)]
+#![allow(clippy::result_large_err)]
+#![allow(clippy::only_used_in_recursion)]
 
 //!<div align="center">
 //!  <!-- Version -->

src/proxy.rs

@@ -101,7 +101,7 @@ impl Proxy {
         };
 
         let remaining_parts = proxy_parts.next();
-        if remaining_parts == None {
+        if remaining_parts.is_none() {
             return Err(ErrorKind::InvalidProxyUrl.new());
         }
 
@@ -131,7 +131,7 @@ impl Proxy {
 
     pub(crate) fn connect<S: AsRef<str>>(&self, host: S, port: u16) -> String {
         let authorization = if self.use_authorization() {
-            let creds = base64::encode(&format!(
+            let creds = base64::encode(format!(
                 "{}:{}",
                 self.user.clone().unwrap_or_default(),
                 self.password.clone().unwrap_or_default()

src/stream.rs

@@ -361,7 +361,8 @@ pub(crate) fn connect_host(
         debug!("connecting to {} at {}", netloc, &sock_addr);
 
         // connect with a configured timeout.
-        let stream = if None != proto && Some(Proto::HTTPConnect) != proto {
+        #[allow(clippy::unnecessary_unwrap)]
+        let stream = if proto.is_some() && Some(Proto::HTTPConnect) != proto {
             connect_socks(
                 unit,
                 proxy.clone().unwrap(),
@@ -374,7 +375,7 @@ pub(crate) fn connect_host(
         } else if let Some(timeout) = timeout {
             TcpStream::connect_timeout(&sock_addr, timeout)
         } else {
-            TcpStream::connect(&sock_addr)
+            TcpStream::connect(sock_addr)
         };
 
         if let Ok(stream) = stream {

src/unit.rs

@@ -87,7 +87,7 @@ impl Unit {
             if (!username.is_empty() || !password.is_empty())
                 && get_header(&headers, "authorization").is_none()
             {
-                let encoded = base64::encode(&format!("{}:{}", username, password));
+                let encoded = base64::encode(format!("{}:{}", username, password));
                 extra.push(Header::new("Authorization", &format!("Basic {}", encoded)));
             }