property treat header names as case insensitive

src/header/common/accept.rs

@@ -22,7 +22,7 @@ pub struct Accept(pub Vec<Mime>);
 
 impl Header for Accept {
     fn header_name(_: Option<Accept>) -> &'static str {
-        "accept"
+        "Accept"
     }
 
     fn parse_header(_raw: &[Vec<u8>]) -> Option<Accept> {

src/header/common/connection.rs

@@ -28,7 +28,7 @@ impl FromStr for Connection {
 
 impl Header for Connection {
     fn header_name(_: Option<Connection>) -> &'static str {
-        "connection"
+        "Connection"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<Connection> {

src/header/common/content_length.rs

@@ -11,7 +11,7 @@ pub struct ContentLength(pub uint);
 
 impl Header for ContentLength {
     fn header_name(_: Option<ContentLength>) -> &'static str {
-        "content-length"
+        "Content-Length"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<ContentLength> {

src/header/common/content_type.rs

@@ -12,7 +12,7 @@ pub struct ContentType(pub Mime);
 
 impl Header for ContentType {
     fn header_name(_: Option<ContentType>) -> &'static str {
-        "content-type"
+        "Content-Type"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<ContentType> {

src/header/common/date.rs

@@ -11,7 +11,7 @@ pub struct Date(pub Tm);
 
 impl Header for Date {
     fn header_name(_: Option<Date>) -> &'static str {
-        "date"
+        "Date"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<Date> {

src/header/common/host.rs

@@ -14,7 +14,7 @@ pub struct Host(pub String);
 
 impl Header for Host {
     fn header_name(_: Option<Host>) -> &'static str {
-        "host"
+        "Host"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<Host> {

src/header/common/server.rs

@@ -10,7 +10,7 @@ pub struct Server(pub String);
 
 impl Header for Server {
     fn header_name(_: Option<Server>) -> &'static str {
-        "server"
+        "Server"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<Server> {

src/header/common/transfer_encoding.rs

@@ -57,7 +57,7 @@ impl FromStr for Encoding {
 
 impl Header for TransferEncoding {
     fn header_name(_: Option<TransferEncoding>) -> &'static str {
-        "transfer-encoding"
+        "Transfer-Encoding"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<TransferEncoding> {

src/header/common/user_agent.rs

@@ -10,7 +10,7 @@ pub struct UserAgent(pub String);
 
 impl Header for UserAgent {
     fn header_name(_: Option<UserAgent>) -> &'static str {
-        "user-agent"
+        "User-Agent"
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> Option<UserAgent> {