diff --git a/Cargo.toml b/Cargo.toml
index 420b3a2787..f8bae8ceaa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,7 @@ tokio-core = "0.1.6"
 tokio-proto = "0.1"
 tokio-service = "0.1"
 tokio-io = "0.1"
-unicase = "1.0"
+unicase = "2.0"
 url = "1.0"
 
 [dev-dependencies]
diff --git a/src/header/common/access_control_allow_credentials.rs b/src/header/common/access_control_allow_credentials.rs
index 8b442ea2c4..844e34e621 100644
--- a/src/header/common/access_control_allow_credentials.rs
+++ b/src/header/common/access_control_allow_credentials.rs
@@ -1,6 +1,6 @@
 use std::fmt::{self, Display};
 use std::str;
-use unicase::UniCase;
+use unicase;
 use header::{Header, Raw};
 
 /// `Access-Control-Allow-Credentials` header, part of
@@ -38,7 +38,7 @@ use header::{Header, Raw};
 #[derive(Clone, PartialEq, Debug)]
 pub struct AccessControlAllowCredentials;
 
-const ACCESS_CONTROL_ALLOW_CREDENTIALS_TRUE: UniCase<&'static str> = UniCase("true");
+const ACCESS_CONTROL_ALLOW_CREDENTIALS_TRUE: &'static str = "true";
 
 impl Header for AccessControlAllowCredentials {
     fn header_name() -> &'static str {
@@ -56,7 +56,7 @@ impl Header for AccessControlAllowCredentials {
                 //    None. No big deal.
                 str::from_utf8_unchecked(line)
             };
-            if UniCase(text) == ACCESS_CONTROL_ALLOW_CREDENTIALS_TRUE {
+            if unicase::eq_ascii(text, ACCESS_CONTROL_ALLOW_CREDENTIALS_TRUE) {
                 return Ok(AccessControlAllowCredentials);
             }
         }
diff --git a/src/header/common/access_control_allow_headers.rs b/src/header/common/access_control_allow_headers.rs
index e753bde1ec..889e84c3d3 100644
--- a/src/header/common/access_control_allow_headers.rs
+++ b/src/header/common/access_control_allow_headers.rs
@@ -1,4 +1,4 @@
-use unicase::UniCase;
+use unicase::Ascii;
 
 header! {
     /// `Access-Control-Allow-Headers` header, part of
@@ -24,11 +24,11 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, AccessControlAllowHeaders};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
-    ///     AccessControlAllowHeaders(vec![UniCase("date".to_owned())])
+    ///     AccessControlAllowHeaders(vec![Ascii::new("date".to_owned())])
     /// );
     /// # }
     /// ```
@@ -39,18 +39,18 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, AccessControlAllowHeaders};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
     ///     AccessControlAllowHeaders(vec![
-    ///         UniCase("accept-language".to_owned()),
-    ///         UniCase("date".to_owned()),
+    ///         Ascii::new("accept-language".to_owned()),
+    ///         Ascii::new("date".to_owned()),
     ///     ])
     /// );
     /// # }
     /// ```
-    (AccessControlAllowHeaders, "Access-Control-Allow-Headers") => (UniCase<String>)*
+    (AccessControlAllowHeaders, "Access-Control-Allow-Headers") => (Ascii<String>)*
 
     test_access_control_allow_headers {
         test_header!(test1, vec![b"accept-language, date"]);
diff --git a/src/header/common/access_control_expose_headers.rs b/src/header/common/access_control_expose_headers.rs
index ac187446c4..951ed05eb6 100644
--- a/src/header/common/access_control_expose_headers.rs
+++ b/src/header/common/access_control_expose_headers.rs
@@ -1,4 +1,4 @@
-use unicase::UniCase;
+use unicase::Ascii;
 
 header! {
     /// `Access-Control-Expose-Headers` header, part of
@@ -23,13 +23,13 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, AccessControlExposeHeaders};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
     ///     AccessControlExposeHeaders(vec![
-    ///         UniCase("etag".to_owned()),
-    ///         UniCase("content-length".to_owned())
+    ///         Ascii::new("etag".to_owned()),
+    ///         Ascii::new("content-length".to_owned())
     ///     ])
     /// );
     /// # }
@@ -41,18 +41,18 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, AccessControlExposeHeaders};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
     ///     AccessControlExposeHeaders(vec![
-    ///         UniCase("etag".to_owned()),
-    ///         UniCase("content-length".to_owned())
+    ///         Ascii::new("etag".to_owned()),
+    ///         Ascii::new("content-length".to_owned())
     ///     ])
     /// );
     /// # }
     /// ```
-    (AccessControlExposeHeaders, "Access-Control-Expose-Headers") => (UniCase<String>)*
+    (AccessControlExposeHeaders, "Access-Control-Expose-Headers") => (Ascii<String>)*
 
     test_access_control_expose_headers {
         test_header!(test1, vec![b"etag, content-length"]);
diff --git a/src/header/common/access_control_request_headers.rs b/src/header/common/access_control_request_headers.rs
index b08cb33cd8..009a08aa59 100644
--- a/src/header/common/access_control_request_headers.rs
+++ b/src/header/common/access_control_request_headers.rs
@@ -1,4 +1,4 @@
-use unicase::UniCase;
+use unicase::Ascii;
 
 header! {
     /// `Access-Control-Request-Headers` header, part of
@@ -24,11 +24,11 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, AccessControlRequestHeaders};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
-    ///     AccessControlRequestHeaders(vec![UniCase("date".to_owned())])
+    ///     AccessControlRequestHeaders(vec![Ascii::new("date".to_owned())])
     /// );
     /// # }
     /// ```
@@ -39,18 +39,18 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, AccessControlRequestHeaders};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
     ///     AccessControlRequestHeaders(vec![
-    ///         UniCase("accept-language".to_owned()),
-    ///         UniCase("date".to_owned()),
+    ///         Ascii::new("accept-language".to_owned()),
+    ///         Ascii::new("date".to_owned()),
     ///     ])
     /// );
     /// # }
     /// ```
-    (AccessControlRequestHeaders, "Access-Control-Request-Headers") => (UniCase<String>)*
+    (AccessControlRequestHeaders, "Access-Control-Request-Headers") => (Ascii<String>)*
 
     test_access_control_request_headers {
         test_header!(test1, vec![b"accept-language, date"]);
diff --git a/src/header/common/connection.rs b/src/header/common/connection.rs
index a48594a30a..87158ac545 100644
--- a/src/header/common/connection.rs
+++ b/src/header/common/connection.rs
@@ -1,11 +1,11 @@
 use std::fmt::{self, Display};
 use std::str::FromStr;
-use unicase::UniCase;
+use unicase::Ascii;
 
 pub use self::ConnectionOption::{KeepAlive, Close, ConnectionHeader};
 
-const KEEP_ALIVE: UniCase<&'static str> = UniCase("keep-alive");
-const CLOSE: UniCase<&'static str> = UniCase("close");
+static KEEP_ALIVE: &'static str = "keep-alive";
+static CLOSE: &'static str = "close";
 
 /// Values that can be in the `Connection` header.
 #[derive(Clone, PartialEq, Debug)]
@@ -22,18 +22,18 @@ pub enum ConnectionOption {
     // TODO: it would be nice if these "Strings" could be stronger types, since
     // they are supposed to relate to other Header fields (which we have strong
     // types for).
-    ConnectionHeader(UniCase<String>),
+    ConnectionHeader(Ascii<String>),
 }
 
 impl FromStr for ConnectionOption {
     type Err = ();
     fn from_str(s: &str) -> Result<ConnectionOption, ()> {
-        if UniCase(s) == KEEP_ALIVE {
+        if Ascii::new(s) == KEEP_ALIVE {
             Ok(KeepAlive)
-        } else if UniCase(s) == CLOSE {
+        } else if Ascii::new(s) == CLOSE {
             Ok(Close)
         } else {
-            Ok(ConnectionHeader(UniCase(s.to_owned())))
+            Ok(ConnectionHeader(Ascii::new(s.to_owned())))
         }
     }
 }
@@ -43,7 +43,7 @@ impl Display for ConnectionOption {
         f.write_str(match *self {
             KeepAlive => "keep-alive",
             Close => "close",
-            ConnectionHeader(UniCase(ref s)) => s.as_ref()
+            ConnectionHeader(ref s) => s.as_ref()
         })
     }
 }
@@ -83,12 +83,12 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, Connection, ConnectionOption};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
     ///     Connection(vec![
-    ///         ConnectionOption::ConnectionHeader(UniCase("upgrade".to_owned())),
+    ///         ConnectionOption::ConnectionHeader(Ascii::new("upgrade".to_owned())),
     ///     ])
     /// );
     /// # }
@@ -124,7 +124,7 @@ bench_header!(header, Connection, { vec![b"authorization".to_vec()] });
 mod tests {
     use super::{Connection,ConnectionHeader};
     use header::Header;
-    use unicase::UniCase;
+    use unicase::Ascii;
 
     fn parse_option(header: Vec<u8>) -> Connection {
         let val = header.into();
@@ -137,7 +137,7 @@ mod tests {
         assert_eq!(Connection::close(),parse_option(b"close".to_vec()));
         assert_eq!(Connection::keep_alive(),parse_option(b"keep-alive".to_vec()));
         assert_eq!(Connection::keep_alive(),parse_option(b"Keep-Alive".to_vec()));
-        assert_eq!(Connection(vec![ConnectionHeader(UniCase("upgrade".to_owned()))]),
+        assert_eq!(Connection(vec![ConnectionHeader(Ascii::new("upgrade".to_owned()))]),
             parse_option(b"upgrade".to_vec()));
     }
 }
diff --git a/src/header/common/content_disposition.rs b/src/header/common/content_disposition.rs
index 243308e495..3cf198a3fd 100644
--- a/src/header/common/content_disposition.rs
+++ b/src/header/common/content_disposition.rs
@@ -8,7 +8,7 @@
 
 use language_tags::LanguageTag;
 use std::fmt;
-use unicase::UniCase;
+use unicase;
 
 use header::{Header, Raw, parsing};
 use header::parsing::{parse_extended_value, http_percent_encode};
@@ -102,9 +102,9 @@ impl Header for ContentDisposition {
             };
 
             let mut cd = ContentDisposition {
-                disposition: if UniCase(&*disposition) == UniCase("inline") {
+                disposition: if unicase::eq_ascii(&*disposition, "inline") {
                     DispositionType::Inline
-                } else if UniCase(&*disposition) == UniCase("attachment") {
+                } else if unicase::eq_ascii(&*disposition, "attachment") {
                     DispositionType::Attachment
                 } else {
                     DispositionType::Ext(disposition.to_owned())
@@ -128,11 +128,11 @@ impl Header for ContentDisposition {
                 };
 
                 cd.parameters.push(
-                    if UniCase(&*key) == UniCase("filename") {
+                    if unicase::eq_ascii(&*key, "filename") {
                         DispositionParam::Filename(
                             Charset::Ext("UTF-8".to_owned()), None,
                             val.trim_matches('"').as_bytes().to_owned())
-                    } else if UniCase(&*key) == UniCase("filename*") {
+                    } else if unicase::eq_ascii(&*key, "filename*") {
                         let extended_value = try!(parse_extended_value(val));
                         DispositionParam::Filename(extended_value.charset, extended_value.language_tag, extended_value.value)
                     } else {
@@ -164,7 +164,7 @@ impl fmt::Display for ContentDisposition {
                     let mut use_simple_format: bool = false;
                     if opt_lang.is_none() {
                         if let Charset::Ext(ref ext) = *charset {
-                            if UniCase(&**ext) == UniCase("utf-8") {
+                            if unicase::eq_ascii(&**ext, "utf-8") {
                                 use_simple_format = true;
                             }
                         }
diff --git a/src/header/common/expect.rs b/src/header/common/expect.rs
index 0d918dd5db..f710bbc218 100644
--- a/src/header/common/expect.rs
+++ b/src/header/common/expect.rs
@@ -1,7 +1,7 @@
 use std::fmt;
 use std::str;
 
-use unicase::UniCase;
+use unicase;
 
 use header::{Header, Raw};
 
@@ -26,8 +26,6 @@ pub enum Expect {
     Continue
 }
 
-const EXPECT_CONTINUE: UniCase<&'static str> = UniCase("100-continue");
-
 impl Header for Expect {
     fn header_name() -> &'static str {
         static NAME: &'static str = "Expect";
@@ -44,7 +42,7 @@ impl Header for Expect {
                 //    None. No big deal.
                 str::from_utf8_unchecked(line)
             };
-            if UniCase(text) == EXPECT_CONTINUE {
+            if unicase::eq_ascii(text, "100-continue") {
                 Ok(Expect::Continue)
             } else {
                 Err(::Error::Header)
diff --git a/src/header/common/strict_transport_security.rs b/src/header/common/strict_transport_security.rs
index 388b6ee21c..a4c06d98f7 100644
--- a/src/header/common/strict_transport_security.rs
+++ b/src/header/common/strict_transport_security.rs
@@ -1,7 +1,7 @@
 use std::fmt;
 use std::str::{self, FromStr};
 
-use unicase::UniCase;
+use unicase;
 
 use header::{Header, Raw, parsing};
 
@@ -85,13 +85,13 @@ impl FromStr for StrictTransportSecurity {
     fn from_str(s: &str) -> ::Result<StrictTransportSecurity> {
         s.split(';')
             .map(str::trim)
-            .map(|sub| if UniCase(sub) == UniCase("includeSubdomains") {
+            .map(|sub| if unicase::eq_ascii(sub, "includeSubdomains") {
                 Ok(Directive::IncludeSubdomains)
             } else {
                 let mut sub = sub.splitn(2, '=');
                 match (sub.next(), sub.next()) {
                     (Some(left), Some(right))
-                    if UniCase(left.trim()) == UniCase("max-age") => {
+                    if unicase::eq_ascii(left.trim(), "max-age") => {
                         right
                             .trim()
                             .trim_matches('"')
diff --git a/src/header/common/upgrade.rs b/src/header/common/upgrade.rs
index d0b3737ff8..57c3978f48 100644
--- a/src/header/common/upgrade.rs
+++ b/src/header/common/upgrade.rs
@@ -1,6 +1,6 @@
 use std::fmt::{self, Display};
 use std::str::FromStr;
-use unicase::UniCase;
+use unicase;
 
 header! {
     /// `Upgrade` header, defined in [RFC7230](http://tools.ietf.org/html/rfc7230#section-6.7)
@@ -99,7 +99,7 @@ impl FromStr for ProtocolName {
             "TLS" => ProtocolName::Tls,
             "h2c" => ProtocolName::H2c,
             _ => {
-                if UniCase(s) == UniCase("websocket") {
+                if unicase::eq_ascii(s, "websocket") {
                     ProtocolName::WebSocket
                 } else {
                     ProtocolName::Unregistered(s.to_owned())
diff --git a/src/header/common/vary.rs b/src/header/common/vary.rs
index 9f3d05548e..273ce902f7 100644
--- a/src/header/common/vary.rs
+++ b/src/header/common/vary.rs
@@ -1,4 +1,4 @@
-use unicase::UniCase;
+use unicase::Ascii;
 
 header! {
     /// `Vary` header, defined in [RFC7231](https://tools.ietf.org/html/rfc7231#section-7.1.4)
@@ -34,18 +34,18 @@ header! {
     /// // extern crate unicase;
     ///
     /// use hyper::header::{Headers, Vary};
-    /// use unicase::UniCase;
+    /// use unicase::Ascii;
     ///
     /// let mut headers = Headers::new();
     /// headers.set(
     ///     Vary::Items(vec![
-    ///         UniCase("accept-encoding".to_owned()),
-    ///         UniCase("accept-language".to_owned()),
+    ///         Ascii::new("accept-encoding".to_owned()),
+    ///         Ascii::new("accept-language".to_owned()),
     ///     ])
     /// );
     /// # }
     /// ```
-    (Vary, "Vary") => {Any / (UniCase<String>)+}
+    (Vary, "Vary") => {Any / (Ascii<String>)+}
 
     test_vary {
         test_header!(test1, vec![b"accept-encoding, accept-language"]);
diff --git a/src/header/mod.rs b/src/header/mod.rs
index 88a9c9c5d0..39206f80bd 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -80,7 +80,7 @@ use std::borrow::{Cow, ToOwned};
 use std::iter::{FromIterator, IntoIterator};
 use std::{mem, fmt};
 
-use unicase::UniCase;
+use unicase::Ascii;
 
 use self::internals::{Item, VecMap, Entry};
 use self::sealed::{GetType, HeaderClone};
@@ -329,7 +329,7 @@ macro_rules! literals {
             match s.len() {
                 $($len => {
                     $(
-                    if UniCase(<$header>::header_name()) == s {
+                    if Ascii::new(<$header>::header_name()) == Ascii::new(s) {
                         return Cow::Borrowed(<$header>::header_name());
                     }
                     )+
@@ -390,19 +390,19 @@ impl Headers {
     /// The field is determined by the type of the value being set.
     pub fn set<H: Header>(&mut self, value: H) {
         trace!("Headers.set( {:?}, {:?} )", header_name::<H>(), HeaderValueString(&value));
-        self.data.insert(HeaderName(UniCase(Cow::Borrowed(header_name::<H>()))),
+        self.data.insert(HeaderName(Ascii::new(Cow::Borrowed(header_name::<H>()))),
                          Item::new_typed(Box::new(value)));
     }
 
     /// Get a reference to the header field's value, if it exists.
     pub fn get<H: Header>(&self) -> Option<&H> {
-        self.data.get(&HeaderName(UniCase(Cow::Borrowed(header_name::<H>()))))
+        self.data.get(&HeaderName(Ascii::new(Cow::Borrowed(header_name::<H>()))))
         .and_then(Item::typed::<H>)
     }
 
     /// Get a mutable reference to the header field's value, if it exists.
     pub fn get_mut<H: Header>(&mut self) -> Option<&mut H> {
-        self.data.get_mut(&HeaderName(UniCase(Cow::Borrowed(header_name::<H>()))))
+        self.data.get_mut(&HeaderName(Ascii::new(Cow::Borrowed(header_name::<H>()))))
         .and_then(Item::typed_mut::<H>)
     }
 
@@ -418,7 +418,7 @@ impl Headers {
     /// assert!(headers.has::<ContentType>());
     /// ```
     pub fn has<H: Header>(&self) -> bool {
-        self.data.contains_key(&HeaderName(UniCase(Cow::Borrowed(header_name::<H>()))))
+        self.data.contains_key(&HeaderName(Ascii::new(Cow::Borrowed(header_name::<H>()))))
     }
 
     /// Removes a header from the map, if one existed.
@@ -428,7 +428,7 @@ impl Headers {
     /// know whether a header exists, rather rely on `has`.
     pub fn remove<H: Header>(&mut self) -> Option<H> {
         trace!("Headers.remove( {:?} )", header_name::<H>());
-        self.data.remove(&HeaderName(UniCase(Cow::Borrowed(header_name::<H>()))))
+        self.data.remove(&HeaderName(Ascii::new(Cow::Borrowed(header_name::<H>()))))
             .and_then(Item::into_typed::<H>)
     }
 
@@ -484,7 +484,7 @@ impl Headers {
         let name = name.into();
         let value = value.into();
         trace!("Headers.set_raw( {:?}, {:?} )", name, value);
-        self.data.insert(HeaderName(UniCase(name)), Item::new_raw(value));
+        self.data.insert(HeaderName(Ascii::new(name)), Item::new_raw(value));
     }
 
     /// Append a value to raw value of this header.
@@ -506,7 +506,7 @@ impl Headers {
         let name = name.into();
         let value = value.into();
         trace!("Headers.append_raw( {:?}, {:?} )", name, value);
-        let name = HeaderName(UniCase(name));
+        let name = HeaderName(Ascii::new(name));
         if let Some(item) = self.data.get_mut(&name) {
             item.raw_mut().push(value);
             return;
@@ -520,7 +520,6 @@ impl Headers {
         self.data.remove(name);
     }
 
-
 }
 
 impl PartialEq for Headers {
@@ -577,7 +576,7 @@ impl<'a> HeaderView<'a> {
     /// Check if a HeaderView is a certain Header.
     #[inline]
     pub fn is<H: Header>(&self) -> bool {
-        HeaderName(UniCase(Cow::Borrowed(header_name::<H>()))) == *self.0
+        HeaderName(Ascii::new(Cow::Borrowed(header_name::<H>()))) == *self.0
     }
 
     /// Get the Header name as a slice.
@@ -633,7 +632,7 @@ impl<'a> Extend<HeaderView<'a>> for Headers {
 impl<'a> Extend<(&'a str, Bytes)> for Headers {
     fn extend<I: IntoIterator<Item=(&'a str, Bytes)>>(&mut self, iter: I) {
         for (name, value) in iter {
-            let name = HeaderName(UniCase(maybe_literal(name)));
+            let name = HeaderName(Ascii::new(maybe_literal(name)));
             //let trim = header.value.iter().rev().take_while(|&&x| x == b' ').count();
 
             match self.data.entry(name) {
@@ -657,7 +656,7 @@ impl<'a> FromIterator<HeaderView<'a>> for Headers {
 }
 
 #[derive(Clone, Debug)]
-struct HeaderName(UniCase<Cow<'static, str>>);
+struct HeaderName(Ascii<Cow<'static, str>>);
 
 impl fmt::Display for HeaderName {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -667,7 +666,7 @@ impl fmt::Display for HeaderName {
 
 impl AsRef<str> for HeaderName {
     fn as_ref(&self) -> &str {
-        ((self.0).0).as_ref()
+        self.0.as_ref()
     }
 }