diff --git a/src/client/mod.rs b/src/client/mod.rs
index 5a42064a..5d48fb60 100644
--- a/src/client/mod.rs
+++ b/src/client/mod.rs
@@ -239,8 +239,8 @@ impl<'a> RequestBuilder<'a> {
         let mut url = try!(url);
         trace!("send {:?} {:?}", method, url);
 
-        let can_have_body = match &method {
-            &Method::Get | &Method::Head => false,
+        let can_have_body = match method {
+            Method::Get | Method::Head => false,
             _ => true
         };
 
diff --git a/src/client/request.rs b/src/client/request.rs
index 1dba0f63..7c3060c3 100644
--- a/src/client/request.rs
+++ b/src/client/request.rs
@@ -80,8 +80,8 @@ impl Request<Fresh> {
 
     /// Create a new client request.
     pub fn new(method: Method, url: Url) -> ::Result<Request<Fresh>> {
-        let mut conn = DefaultConnector::default();
-        Request::with_connector(method, url, &mut conn)
+        let conn = DefaultConnector::default();
+        Request::with_connector(method, url, &conn)
     }
 
     /// Create a new client request with a specific underlying NetworkStream.
diff --git a/src/header/common/authorization.rs b/src/header/common/authorization.rs
index d8179405..7d2d0c94 100644
--- a/src/header/common/authorization.rs
+++ b/src/header/common/authorization.rs
@@ -60,13 +60,13 @@ pub struct Authorization<S: Scheme>(pub S);
 impl<S: Scheme> Deref for Authorization<S> {
     type Target = S;
 
-    fn deref<'a>(&'a self) -> &'a S {
+    fn deref(&self) -> &S {
         &self.0
     }
 }
 
 impl<S: Scheme> DerefMut for Authorization<S> {
-    fn deref_mut<'a>(&'a mut self) -> &'a mut S {
+    fn deref_mut(&mut self) -> &mut S {
         &mut self.0
     }
 }
@@ -81,7 +81,7 @@ impl<S: Scheme + Any> Header for Authorization<S> where <S as FromStr>::Err: 'st
             return Err(::Error::Header);
         }
         let header = try!(from_utf8(unsafe { &raw.get_unchecked(0)[..] }));
-        return if let Some(scheme) = <S as Scheme>::scheme() {
+        if let Some(scheme) = <S as Scheme>::scheme() {
             if header.starts_with(scheme) && header.len() > scheme.len() + 1 {
                 match header[scheme.len() + 1..].parse::<S>().map(Authorization) {
                     Ok(h) => Ok(h),
diff --git a/src/header/common/content_disposition.rs b/src/header/common/content_disposition.rs
index edb27fec..7816479f 100644
--- a/src/header/common/content_disposition.rs
+++ b/src/header/common/content_disposition.rs
@@ -160,9 +160,9 @@ impl fmt::Display for ContentDisposition {
             DispositionType::Attachment => try!(write!(f, "attachment")),
             DispositionType::Ext(ref s) => try!(write!(f, "{}", s)),
         }
-        for param in self.parameters.iter() {
-            match param {
-                &DispositionParam::Filename(ref charset, ref opt_lang, ref bytes) => {
+        for param in &self.parameters {
+            match *param {
+                DispositionParam::Filename(ref charset, ref opt_lang, ref bytes) => {
                     let mut use_simple_format: bool = false;
                     if opt_lang.is_none() {
                         if let Charset::Ext(ref ext) = *charset {
@@ -188,7 +188,7 @@ impl fmt::Display for ContentDisposition {
                                 bytes, percent_encoding::HTTP_VALUE_ENCODE_SET)))
                     }
                 },
-                &DispositionParam::Ext(ref k, ref v) => try!(write!(f, "; {}=\"{}\"", k, v)),
+                DispositionParam::Ext(ref k, ref v) => try!(write!(f, "; {}=\"{}\"", k, v)),
             }
         }
         Ok(())
diff --git a/src/header/common/content_range.rs b/src/header/common/content_range.rs
index aeeed8ea..2d9a965b 100644
--- a/src/header/common/content_range.rs
+++ b/src/header/common/content_range.rs
@@ -31,8 +31,8 @@ header! {
         test_header!(test_unregistered,
             vec![b"seconds 1-2"],
             Some(ContentRange(ContentRangeSpec::Unregistered {
-                unit: "seconds".to_string(),
-                resp: "1-2".to_string()
+                unit: "seconds".to_owned(),
+                resp: "1-2".to_owned()
             })));
 
         test_header!(test_no_len,
@@ -108,7 +108,7 @@ pub enum ContentRangeSpec {
     }
 }
 
-fn split_in_two<'a>(s: &'a str, separator: char) -> Option<(&'a str, &'a str)> {
+fn split_in_two(s: &str, separator: char) -> Option<(&str, &str)> {
     let mut iter = s.splitn(2, separator);
     match (iter.next(), iter.next()) {
         (Some(a), Some(b)) => Some((a, b)),
@@ -149,8 +149,8 @@ impl FromStr for ContentRangeSpec {
             }
             Some((unit, resp)) => {
                 ContentRangeSpec::Unregistered {
-                    unit: unit.to_string(),
-                    resp: resp.to_string()
+                    unit: unit.to_owned(),
+                    resp: resp.to_owned()
                 }
             }
             _ => return Err(::Error::Header)
diff --git a/src/header/common/if_range.rs b/src/header/common/if_range.rs
index 874cd6fd..7399b3a4 100644
--- a/src/header/common/if_range.rs
+++ b/src/header/common/if_range.rs
@@ -72,9 +72,9 @@ impl Header for IfRange {
 
 impl HeaderFormat for IfRange {
     fn fmt_header(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-        match self {
-            &IfRange::EntityTag(ref x) => Display::fmt(x, f),
-            &IfRange::Date(ref x) => Display::fmt(x, f),
+        match *self {
+            IfRange::EntityTag(ref x) => Display::fmt(x, f),
+            IfRange::Date(ref x) => Display::fmt(x, f),
         }
     }
 }
diff --git a/src/header/common/mod.rs b/src/header/common/mod.rs
index 4fa9c6af..090f0237 100644
--- a/src/header/common/mod.rs
+++ b/src/header/common/mod.rs
@@ -91,13 +91,13 @@ macro_rules! __hyper__deref {
         impl ::std::ops::Deref for $from {
             type Target = $to;
 
-            fn deref<'a>(&'a self) -> &'a $to {
+            fn deref(&self) -> &$to {
                 &self.0
             }
         }
 
         impl ::std::ops::DerefMut for $from {
-            fn deref_mut<'a>(&'a mut self) -> &'a mut $to {
+            fn deref_mut(&mut self) -> &mut $to {
                 &mut self.0
             }
         }
@@ -297,7 +297,7 @@ macro_rules! header {
                         return Ok($id::Any)
                     }
                 }
-                $crate::header::parsing::from_comma_delimited(raw).map(|vec| $id::Items(vec))
+                $crate::header::parsing::from_comma_delimited(raw).map($id::Items)
             }
         }
         impl $crate::header::HeaderFormat for $id {
diff --git a/src/header/common/range.rs b/src/header/common/range.rs
index 0651012a..8b09860b 100644
--- a/src/header/common/range.rs
+++ b/src/header/common/range.rs
@@ -157,10 +157,10 @@ impl FromStr for ByteRangeSpec {
 
         match (parts.next(), parts.next()) {
             (Some(""), Some(end)) => {
-                end.parse().or(Err(::Error::Header)).map(|end| ByteRangeSpec::Last(end))
+                end.parse().or(Err(::Error::Header)).map(ByteRangeSpec::Last)
             },
             (Some(start), Some("")) => {
-                start.parse().or(Err(::Error::Header)).map(|start| ByteRangeSpec::AllFrom(start))
+                start.parse().or(Err(::Error::Header)).map(ByteRangeSpec::AllFrom)
             },
             (Some(start), Some(end)) => {
                 match (start.parse(), end.parse()) {
diff --git a/src/header/internals/cell.rs b/src/header/internals/cell.rs
index 65a45fdb..38365b73 100644
--- a/src/header/internals/cell.rs
+++ b/src/header/internals/cell.rs
@@ -32,7 +32,7 @@ impl<T> OptCell<T> {
 impl<T> Deref for OptCell<T> {
     type Target = Option<T>;
     #[inline]
-    fn deref<'a>(&'a self) -> &'a Option<T> {
+    fn deref(&self) -> &Option<T> {
         unsafe { &*self.0.get() }
     }
 }
diff --git a/src/header/mod.rs b/src/header/mod.rs
index fa12d1de..b71dc717 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -193,7 +193,7 @@ impl Headers {
     }
 
     #[doc(hidden)]
-    pub fn from_raw<'a>(raw: &[httparse::Header<'a>]) -> ::Result<Headers> {
+    pub fn from_raw(raw: &[httparse::Header]) -> ::Result<Headers> {
         let mut headers = Headers::new();
         for header in raw {
             trace!("raw header: {:?}={:?}", header.name, &header.value[..]);
@@ -292,7 +292,7 @@ impl Headers {
     }
 
     /// Returns an iterator over the header fields.
-    pub fn iter<'a>(&'a self) -> HeadersItems<'a> {
+    pub fn iter(&self) -> HeadersItems {
         HeadersItems {
             inner: self.data.iter()
         }
@@ -321,7 +321,7 @@ impl PartialEq for Headers {
                 _ => { return false; }
             }
         }
-        return true;
+        true
     }
 }
 
diff --git a/src/header/shared/entity.rs b/src/header/shared/entity.rs
index 30f5c6c0..0d51d5cf 100644
--- a/src/header/shared/entity.rs
+++ b/src/header/shared/entity.rs
@@ -109,9 +109,10 @@ impl EntityTag {
 
 impl Display for EntityTag {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self.weak {
-            true => write!(f, "W/\"{}\"", self.tag),
-            false => write!(f, "\"{}\"", self.tag),
+        if self.weak {
+            write!(f, "W/\"{}\"", self.tag)
+        } else {
+            write!(f, "\"{}\"", self.tag)
         }
     }
 }
diff --git a/src/header/shared/quality_item.rs b/src/header/shared/quality_item.rs
index 219b10cb..70089e4d 100644
--- a/src/header/shared/quality_item.rs
+++ b/src/header/shared/quality_item.rs
@@ -101,7 +101,7 @@ impl<T: str::FromStr> str::FromStr for QualityItem<T> {
         match raw_item.parse::<T>() {
             // we already checked above that the quality is within range
             Ok(item) => Ok(QualityItem::new(item, from_f32(quality))),
-            Err(_) => return Err(::Error::Header),
+            Err(_) => Err(::Error::Header),
         }
     }
 }
diff --git a/src/http/h1.rs b/src/http/h1.rs
index a6be4261..669a753e 100644
--- a/src/http/h1.rs
+++ b/src/http/h1.rs
@@ -171,8 +171,8 @@ impl HttpMessage for Http11Message {
                         }
                     }
                 };
-                match &head.method {
-                    &Method::Get | &Method::Head => {
+                match head.method {
+                    Method::Get | Method::Head => {
                         let writer = match write_headers(stream, &head) {
                             Ok(w) => w,
                             Err(e) => {
@@ -734,7 +734,7 @@ impl<W: Write> HttpWriter<W> {
 
     /// Access the inner Writer.
     #[inline]
-    pub fn get_ref<'a>(&'a self) -> &'a W {
+    pub fn get_ref(&self) -> &W {
         match *self {
             ThroughWriter(ref w) => w,
             ChunkedWriter(ref w) => w,
@@ -748,7 +748,7 @@ impl<W: Write> HttpWriter<W> {
     /// Warning: You should not write to this directly, as you can corrupt
     /// the state.
     #[inline]
-    pub fn get_mut<'a>(&'a mut self) -> &'a mut W {
+    pub fn get_mut(&mut self) -> &mut W {
         match *self {
             ThroughWriter(ref mut w) => w,
             ChunkedWriter(ref mut w) => w,
diff --git a/src/http/h2.rs b/src/http/h2.rs
index 94302898..cda4f0ca 100644
--- a/src/http/h2.rs
+++ b/src/http/h2.rs
@@ -302,7 +302,7 @@ fn prepare_headers(mut headers: Headers) -> Vec<Http2Header> {
 /// A helper function that prepares the body for sending in an HTTP/2 request.
 #[inline]
 fn prepare_body(body: Vec<u8>) -> Option<Vec<u8>> {
-    if body.len() == 0 {
+    if body.is_empty() {
         None
     } else {
         Some(body)
@@ -322,7 +322,7 @@ fn parse_headers(http2_headers: Vec<Http2Header>) -> ::Result<Headers> {
     }
 
     let mut raw_headers = Vec::new();
-    for &(ref name, ref value) in headers.iter() {
+    for &(ref name, ref value) in &headers {
         raw_headers.push(httparse::Header { name: &name, value: &value });
     }