refactor(http): move h1 and h2 into http module

This commit is contained in:
Sean McArthur
2015-06-02 12:24:56 -07:00
parent 486a219bc8
commit 71ac65da5b
12 changed files with 351 additions and 350 deletions

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@@ -8,7 +8,7 @@ use std::io;
use hyper::Client;
use hyper::header::Connection;
use hyper::http2;
use hyper::http::h2;
fn main() {
env_logger::init().unwrap();
@@ -21,7 +21,7 @@ fn main() {
}
};
let mut client = Client::with_protocol(http2::new_protocol());
let mut client = Client::with_protocol(h2::new_protocol());
// `Connection: Close` is not a valid header for HTTP/2, but the client handles it gracefully.
let mut res = client.get(&*url)

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@@ -54,8 +54,8 @@ pub mod pool;
pub mod request;
pub mod response;
use message::Protocol;
use http11::Http11Protocol;
use http::Protocol;
use http::h1::Http11Protocol;
/// A Client to use additional features with Requests.
///

View File

@@ -11,8 +11,8 @@ use net::{NetworkStream, NetworkConnector, HttpConnector, Fresh, Streaming};
use version;
use client::{Response, get_host_and_port};
use message::{HttpMessage, RequestHead};
use http11::Http11Message;
use http::{HttpMessage, RequestHead};
use http::h1::Http11Message;
/// A client request to a remote server.
@@ -136,7 +136,7 @@ mod tests {
use header::{ContentLength,TransferEncoding,Encoding};
use url::form_urlencoded;
use super::Request;
use http11::Http11Message;
use http::h1::Http11Message;
fn run_request(req: Request<Fresh>) -> Vec<u8> {
let req = req.start().unwrap();

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@@ -3,11 +3,10 @@ use std::io::{self, Read};
use header;
use net::NetworkStream;
use http::{self, RawStatus};
use http::{self, RawStatus, ResponseHead, HttpMessage};
use status;
use version;
use message::{ResponseHead, HttpMessage};
use http11::Http11Message;
use http::h1::Http11Message;
/// A response for a client request to a remote server.
#[derive(Debug)]
@@ -82,7 +81,7 @@ mod tests {
use mock::MockStream;
use status;
use version;
use http11::Http11Message;
use http::h1::Http11Message;
use super::Response;

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@@ -1,22 +1,318 @@
//! Pieces pertaining to the HTTP message protocol.
use std::borrow::{Cow, ToOwned};
//! Adapts the HTTP/1.1 implementation into the `HttpMessage` API.
use std::borrow::Cow;
use std::cmp::min;
use std::io::{self, Read, Write, BufRead};
use std::fmt;
use std::io::{self, Write, BufWriter, BufRead, Read};
use std::net::Shutdown;
use httparse;
use buffer::BufReader;
use header::{Headers, Connection};
use header::ConnectionOption::{Close, KeepAlive};
use method::Method;
use Error;
use header::{Headers, ContentLength, TransferEncoding};
use header::Encoding::Chunked;
use method::{Method};
use net::{NetworkConnector, NetworkStream, ContextVerifier};
use status::StatusCode;
use version::HttpVersion;
use version::HttpVersion::{Http10, Http11};
use uri::RequestUri;
use version::HttpVersion::{self, Http10, Http11};
use {Error};
use self::HttpReader::{SizedReader, ChunkedReader, EofReader, EmptyReader};
use self::HttpWriter::{ThroughWriter, ChunkedWriter, SizedWriter, EmptyWriter};
use self::HttpWriter::{ChunkedWriter, SizedWriter, EmptyWriter, ThroughWriter};
use http::{
RawStatus,
Protocol,
HttpMessage,
RequestHead,
ResponseHead,
};
use header;
use version;
/// An implementation of the `HttpMessage` trait for HTTP/1.1.
#[derive(Debug)]
pub struct Http11Message {
stream: Option<Box<NetworkStream + Send>>,
writer: Option<HttpWriter<BufWriter<Box<NetworkStream + Send>>>>,
reader: Option<HttpReader<BufReader<Box<NetworkStream + Send>>>>,
}
impl Write for Http11Message {
#[inline]
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
match self.writer {
None => Err(io::Error::new(io::ErrorKind::Other,
"Not in a writable state")),
Some(ref mut writer) => writer.write(buf),
}
}
#[inline]
fn flush(&mut self) -> io::Result<()> {
match self.writer {
None => Err(io::Error::new(io::ErrorKind::Other,
"Not in a writable state")),
Some(ref mut writer) => writer.flush(),
}
}
}
impl Read for Http11Message {
#[inline]
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
match self.reader {
None => Err(io::Error::new(io::ErrorKind::Other,
"Not in a readable state")),
Some(ref mut reader) => reader.read(buf),
}
}
}
impl HttpMessage for Http11Message {
fn set_outgoing(&mut self, mut head: RequestHead) -> ::Result<RequestHead> {
if self.stream.is_none() {
return Err(From::from(io::Error::new(
io::ErrorKind::Other,
"Message not idle, cannot start new outgoing")));
}
let mut stream = BufWriter::new(self.stream.take().unwrap());
let mut uri = head.url.serialize_path().unwrap();
if let Some(ref q) = head.url.query {
uri.push('?');
uri.push_str(&q[..]);
}
let version = version::HttpVersion::Http11;
debug!("request line: {:?} {:?} {:?}", head.method, uri, version);
try!(write!(&mut stream, "{} {} {}{}",
head.method, uri, version, LINE_ENDING));
let stream = match head.method {
Method::Get | Method::Head => {
debug!("headers={:?}", head.headers);
try!(write!(&mut stream, "{}{}", head.headers, LINE_ENDING));
EmptyWriter(stream)
},
_ => {
let mut chunked = true;
let mut len = 0;
match head.headers.get::<header::ContentLength>() {
Some(cl) => {
chunked = false;
len = **cl;
},
None => ()
};
// can't do in match above, thanks borrowck
if chunked {
let encodings = match head.headers.get_mut::<header::TransferEncoding>() {
Some(&mut header::TransferEncoding(ref mut encodings)) => {
//TODO: check if chunked is already in encodings. use HashSet?
encodings.push(header::Encoding::Chunked);
false
},
None => true
};
if encodings {
head.headers.set::<header::TransferEncoding>(
header::TransferEncoding(vec![header::Encoding::Chunked]))
}
}
debug!("headers={:?}", head.headers);
try!(write!(&mut stream, "{}{}", head.headers, LINE_ENDING));
if chunked {
ChunkedWriter(stream)
} else {
SizedWriter(stream, len)
}
}
};
self.writer = Some(stream);
Ok(head)
}
fn get_incoming(&mut self) -> ::Result<ResponseHead> {
try!(self.flush_outgoing());
if self.stream.is_none() {
// The message was already in the reading state...
// TODO Decide what happens in case we try to get a new incoming at that point
return Err(From::from(
io::Error::new(io::ErrorKind::Other,
"Read already in progress")));
}
let stream = self.stream.take().unwrap();
let mut stream = BufReader::new(stream);
let head = try!(parse_response(&mut stream));
let raw_status = head.subject;
let headers = head.headers;
let body = if headers.has::<TransferEncoding>() {
match headers.get::<TransferEncoding>() {
Some(&TransferEncoding(ref codings)) => {
if codings.len() > 1 {
trace!("TODO: #2 handle other codings: {:?}", codings);
};
if codings.contains(&Chunked) {
ChunkedReader(stream, None)
} else {
trace!("not chuncked. read till eof");
EofReader(stream)
}
}
None => unreachable!()
}
} else if headers.has::<ContentLength>() {
match headers.get::<ContentLength>() {
Some(&ContentLength(len)) => SizedReader(stream, len),
None => unreachable!()
}
} else {
trace!("neither Transfer-Encoding nor Content-Length");
EofReader(stream)
};
self.reader = Some(body);
Ok(ResponseHead {
headers: headers,
raw_status: raw_status,
version: head.version,
})
}
fn close_connection(&mut self) -> ::Result<()> {
try!(self.get_mut().close(Shutdown::Both));
Ok(())
}
}
impl Http11Message {
/// Consumes the `Http11Message` and returns the underlying `NetworkStream`.
pub fn into_inner(mut self) -> Box<NetworkStream + Send> {
if self.stream.is_some() {
self.stream.take().unwrap()
} else if self.writer.is_some() {
self.writer.take().unwrap().into_inner().into_inner().unwrap()
} else if self.reader.is_some() {
self.reader.take().unwrap().into_inner().into_inner()
} else {
panic!("Http11Message lost its underlying stream somehow");
}
}
/// Gets a mutable reference to the underlying `NetworkStream`, regardless of the state of the
/// `Http11Message`.
pub fn get_mut(&mut self) -> &mut Box<NetworkStream + Send> {
if self.stream.is_some() {
self.stream.as_mut().unwrap()
} else if self.writer.is_some() {
self.writer.as_mut().unwrap().get_mut().get_mut()
} else if self.reader.is_some() {
self.reader.as_mut().unwrap().get_mut().get_mut()
} else {
panic!("Http11Message lost its underlying stream somehow");
}
}
/// Creates a new `Http11Message` that will use the given `NetworkStream` for communicating to
/// the peer.
pub fn with_stream(stream: Box<NetworkStream + Send>) -> Http11Message {
Http11Message {
stream: Some(stream),
writer: None,
reader: None,
}
}
/// Flushes the current outgoing content and moves the stream into the `stream` property.
///
/// TODO It might be sensible to lift this up to the `HttpMessage` trait itself...
pub fn flush_outgoing(&mut self) -> ::Result<()> {
match self.writer {
None => return Ok(()),
Some(_) => {},
};
let writer = self.writer.take().unwrap();
let raw = try!(writer.end()).into_inner().unwrap(); // end() already flushes
self.stream = Some(raw);
Ok(())
}
}
/// The `Protocol` implementation provides HTTP/1.1 messages.
pub struct Http11Protocol {
connector: Connector,
}
impl Protocol for Http11Protocol {
fn new_message(&self, host: &str, port: u16, scheme: &str) -> ::Result<Box<HttpMessage>> {
let stream = try!(self.connector.connect(host, port, scheme)).into();
Ok(Box::new(Http11Message::with_stream(stream)))
}
#[inline]
fn set_ssl_verifier(&mut self, verifier: ContextVerifier) {
self.connector.set_ssl_verifier(verifier);
}
}
impl Http11Protocol {
/// Creates a new `Http11Protocol` instance that will use the given `NetworkConnector` for
/// establishing HTTP connections.
pub fn with_connector<C, S>(c: C) -> Http11Protocol
where C: NetworkConnector<Stream=S> + Send + 'static,
S: NetworkStream + Send {
Http11Protocol {
connector: Connector(Box::new(ConnAdapter(c))),
}
}
}
struct ConnAdapter<C: NetworkConnector + Send>(C);
impl<C: NetworkConnector<Stream=S> + Send, S: NetworkStream + Send> NetworkConnector for ConnAdapter<C> {
type Stream = Box<NetworkStream + Send>;
#[inline]
fn connect(&self, host: &str, port: u16, scheme: &str)
-> ::Result<Box<NetworkStream + Send>> {
Ok(try!(self.0.connect(host, port, scheme)).into())
}
#[inline]
fn set_ssl_verifier(&mut self, verifier: ContextVerifier) {
self.0.set_ssl_verifier(verifier);
}
}
struct Connector(Box<NetworkConnector<Stream=Box<NetworkStream + Send>> + Send>);
impl NetworkConnector for Connector {
type Stream = Box<NetworkStream + Send>;
#[inline]
fn connect(&self, host: &str, port: u16, scheme: &str)
-> ::Result<Box<NetworkStream + Send>> {
Ok(try!(self.0.connect(host, port, scheme)).into())
}
#[inline]
fn set_ssl_verifier(&mut self, verifier: ContextVerifier) {
self.0.set_ssl_verifier(verifier);
}
}
/// Readers to handle different Transfer-Encodings.
///
@@ -451,19 +747,6 @@ pub const LF: u8 = b'\n';
pub const STAR: u8 = b'*';
pub const LINE_ENDING: &'static str = "\r\n";
/// The raw status code and reason-phrase.
#[derive(Clone, PartialEq, Debug)]
pub struct RawStatus(pub u16, pub Cow<'static, str>);
/// Checks if a connection should be kept alive.
pub fn should_keep_alive(version: HttpVersion, headers: &Headers) -> bool {
match (version, headers.get::<Connection>()) {
(Http10, Some(conn)) if !conn.contains(&KeepAlive) => false,
(Http11, Some(conn)) if conn.contains(&Close) => false,
_ => true
}
}
#[cfg(test)]
mod tests {
use std::io::{self, Write};

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@@ -5,16 +5,16 @@ use std::net::Shutdown;
use std::ascii::AsciiExt;
use std::mem;
use message::{
use http::{
Protocol,
HttpMessage,
RequestHead,
ResponseHead,
RawStatus,
};
use net::{NetworkStream, NetworkConnector, ContextVerifier};
use net::{HttpConnector, HttpStream};
use url::Url;
use http::RawStatus;
use header::Headers;
use header;
@@ -397,7 +397,7 @@ mod tests {
use std::io::{Read};
use mock::{MockHttp2Connector, MockStream};
use message::{RequestHead, ResponseHead, Protocol};
use http::{RequestHead, ResponseHead, Protocol};
use header::Headers;
use header;

28
src/http/mod.rs Normal file
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@@ -0,0 +1,28 @@
//! Pieces pertaining to the HTTP message protocol.
use std::borrow::Cow;
use header::Connection;
use header::ConnectionOption::{KeepAlive, Close};
use header::Headers;
use version::HttpVersion;
use version::HttpVersion::{Http10, Http11};
pub use self::message::{HttpMessage, RequestHead, ResponseHead, Protocol};
pub mod h1;
pub mod h2;
pub mod message;
/// The raw status code and reason-phrase.
#[derive(Clone, PartialEq, Debug)]
pub struct RawStatus(pub u16, pub Cow<'static, str>);
/// Checks if a connection should be kept alive.
#[inline]
pub fn should_keep_alive(version: HttpVersion, headers: &Headers) -> bool {
match (version, headers.get::<Connection>()) {
(Http10, Some(conn)) if !conn.contains(&KeepAlive) => false,
(Http11, Some(conn)) if conn.contains(&Close) => false,
_ => true
}
}

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@@ -1,305 +0,0 @@
//! Adapts the HTTP/1.1 implementation into the `HttpMessage` API.
use std::io::{self, Write, BufWriter, Read};
use std::net::Shutdown;
use method::{Method};
use header::{ContentLength, TransferEncoding};
use header::Encoding::Chunked;
use net::{NetworkConnector, NetworkStream, ContextVerifier};
use http::{HttpWriter, LINE_ENDING};
use http::HttpReader::{SizedReader, ChunkedReader, EofReader};
use http::HttpWriter::{ChunkedWriter, SizedWriter, EmptyWriter};
use buffer::BufReader;
use http::{self, HttpReader};
use message::{
Protocol,
HttpMessage,
RequestHead,
ResponseHead,
};
use header;
use version;
/// An implementation of the `HttpMessage` trait for HTTP/1.1.
#[derive(Debug)]
pub struct Http11Message {
stream: Option<Box<NetworkStream + Send>>,
writer: Option<HttpWriter<BufWriter<Box<NetworkStream + Send>>>>,
reader: Option<HttpReader<BufReader<Box<NetworkStream + Send>>>>,
}
impl Write for Http11Message {
#[inline]
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
match self.writer {
None => Err(io::Error::new(io::ErrorKind::Other,
"Not in a writable state")),
Some(ref mut writer) => writer.write(buf),
}
}
#[inline]
fn flush(&mut self) -> io::Result<()> {
match self.writer {
None => Err(io::Error::new(io::ErrorKind::Other,
"Not in a writable state")),
Some(ref mut writer) => writer.flush(),
}
}
}
impl Read for Http11Message {
#[inline]
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
match self.reader {
None => Err(io::Error::new(io::ErrorKind::Other,
"Not in a readable state")),
Some(ref mut reader) => reader.read(buf),
}
}
}
impl HttpMessage for Http11Message {
fn set_outgoing(&mut self, mut head: RequestHead) -> ::Result<RequestHead> {
if self.stream.is_none() {
return Err(From::from(io::Error::new(
io::ErrorKind::Other,
"Message not idle, cannot start new outgoing")));
}
let mut stream = BufWriter::new(self.stream.take().unwrap());
let mut uri = head.url.serialize_path().unwrap();
if let Some(ref q) = head.url.query {
uri.push('?');
uri.push_str(&q[..]);
}
let version = version::HttpVersion::Http11;
debug!("request line: {:?} {:?} {:?}", head.method, uri, version);
try!(write!(&mut stream, "{} {} {}{}",
head.method, uri, version, LINE_ENDING));
let stream = match head.method {
Method::Get | Method::Head => {
debug!("headers={:?}", head.headers);
try!(write!(&mut stream, "{}{}", head.headers, LINE_ENDING));
EmptyWriter(stream)
},
_ => {
let mut chunked = true;
let mut len = 0;
match head.headers.get::<header::ContentLength>() {
Some(cl) => {
chunked = false;
len = **cl;
},
None => ()
};
// can't do in match above, thanks borrowck
if chunked {
let encodings = match head.headers.get_mut::<header::TransferEncoding>() {
Some(&mut header::TransferEncoding(ref mut encodings)) => {
//TODO: check if chunked is already in encodings. use HashSet?
encodings.push(header::Encoding::Chunked);
false
},
None => true
};
if encodings {
head.headers.set::<header::TransferEncoding>(
header::TransferEncoding(vec![header::Encoding::Chunked]))
}
}
debug!("headers={:?}", head.headers);
try!(write!(&mut stream, "{}{}", head.headers, LINE_ENDING));
if chunked {
ChunkedWriter(stream)
} else {
SizedWriter(stream, len)
}
}
};
self.writer = Some(stream);
Ok(head)
}
fn get_incoming(&mut self) -> ::Result<ResponseHead> {
try!(self.flush_outgoing());
if self.stream.is_none() {
// The message was already in the reading state...
// TODO Decide what happens in case we try to get a new incoming at that point
return Err(From::from(
io::Error::new(io::ErrorKind::Other,
"Read already in progress")));
}
let stream = self.stream.take().unwrap();
let mut stream = BufReader::new(stream);
let head = try!(http::parse_response(&mut stream));
let raw_status = head.subject;
let headers = head.headers;
let body = if headers.has::<TransferEncoding>() {
match headers.get::<TransferEncoding>() {
Some(&TransferEncoding(ref codings)) => {
if codings.len() > 1 {
trace!("TODO: #2 handle other codings: {:?}", codings);
};
if codings.contains(&Chunked) {
ChunkedReader(stream, None)
} else {
trace!("not chuncked. read till eof");
EofReader(stream)
}
}
None => unreachable!()
}
} else if headers.has::<ContentLength>() {
match headers.get::<ContentLength>() {
Some(&ContentLength(len)) => SizedReader(stream, len),
None => unreachable!()
}
} else {
trace!("neither Transfer-Encoding nor Content-Length");
EofReader(stream)
};
self.reader = Some(body);
Ok(ResponseHead {
headers: headers,
raw_status: raw_status,
version: head.version,
})
}
fn close_connection(&mut self) -> ::Result<()> {
try!(self.get_mut().close(Shutdown::Both));
Ok(())
}
}
impl Http11Message {
/// Consumes the `Http11Message` and returns the underlying `NetworkStream`.
pub fn into_inner(mut self) -> Box<NetworkStream + Send> {
if self.stream.is_some() {
self.stream.take().unwrap()
} else if self.writer.is_some() {
self.writer.take().unwrap().into_inner().into_inner().unwrap()
} else if self.reader.is_some() {
self.reader.take().unwrap().into_inner().into_inner()
} else {
panic!("Http11Message lost its underlying stream somehow");
}
}
/// Gets a mutable reference to the underlying `NetworkStream`, regardless of the state of the
/// `Http11Message`.
pub fn get_mut(&mut self) -> &mut Box<NetworkStream + Send> {
if self.stream.is_some() {
self.stream.as_mut().unwrap()
} else if self.writer.is_some() {
self.writer.as_mut().unwrap().get_mut().get_mut()
} else if self.reader.is_some() {
self.reader.as_mut().unwrap().get_mut().get_mut()
} else {
panic!("Http11Message lost its underlying stream somehow");
}
}
/// Creates a new `Http11Message` that will use the given `NetworkStream` for communicating to
/// the peer.
pub fn with_stream(stream: Box<NetworkStream + Send>) -> Http11Message {
Http11Message {
stream: Some(stream),
writer: None,
reader: None,
}
}
/// Flushes the current outgoing content and moves the stream into the `stream` property.
///
/// TODO It might be sensible to lift this up to the `HttpMessage` trait itself...
pub fn flush_outgoing(&mut self) -> ::Result<()> {
match self.writer {
None => return Ok(()),
Some(_) => {},
};
let writer = self.writer.take().unwrap();
let raw = try!(writer.end()).into_inner().unwrap(); // end() already flushes
self.stream = Some(raw);
Ok(())
}
}
/// The `Protocol` implementation provides HTTP/1.1 messages.
pub struct Http11Protocol {
connector: Connector,
}
impl Protocol for Http11Protocol {
fn new_message(&self, host: &str, port: u16, scheme: &str) -> ::Result<Box<HttpMessage>> {
let stream = try!(self.connector.connect(host, port, scheme)).into();
Ok(Box::new(Http11Message::with_stream(stream)))
}
#[inline]
fn set_ssl_verifier(&mut self, verifier: ContextVerifier) {
self.connector.set_ssl_verifier(verifier);
}
}
impl Http11Protocol {
/// Creates a new `Http11Protocol` instance that will use the given `NetworkConnector` for
/// establishing HTTP connections.
pub fn with_connector<C, S>(c: C) -> Http11Protocol
where C: NetworkConnector<Stream=S> + Send + 'static,
S: NetworkStream + Send {
Http11Protocol {
connector: Connector(Box::new(ConnAdapter(c))),
}
}
}
struct ConnAdapter<C: NetworkConnector + Send>(C);
impl<C: NetworkConnector<Stream=S> + Send, S: NetworkStream + Send> NetworkConnector for ConnAdapter<C> {
type Stream = Box<NetworkStream + Send>;
#[inline]
fn connect(&self, host: &str, port: u16, scheme: &str)
-> ::Result<Box<NetworkStream + Send>> {
Ok(try!(self.0.connect(host, port, scheme)).into())
}
#[inline]
fn set_ssl_verifier(&mut self, verifier: ContextVerifier) {
self.0.set_ssl_verifier(verifier);
}
}
struct Connector(Box<NetworkConnector<Stream=Box<NetworkStream + Send>> + Send>);
impl NetworkConnector for Connector {
type Stream = Box<NetworkStream + Send>;
#[inline]
fn connect(&self, host: &str, port: u16, scheme: &str)
-> ::Result<Box<NetworkStream + Send>> {
Ok(try!(self.0.connect(host, port, scheme)).into())
}
#[inline]
fn set_ssl_verifier(&mut self, verifier: ContextVerifier) {
self.0.set_ssl_verifier(verifier);
}
}

View File

@@ -186,10 +186,6 @@ pub mod server;
pub mod status;
pub mod uri;
pub mod version;
pub mod message;
pub mod http11;
pub mod http2;
/// Re-exporting the mime crate, for convenience.
pub mod mime {

View File

@@ -10,8 +10,8 @@ use net::NetworkStream;
use version::{HttpVersion};
use method::Method::{self, Get, Head};
use header::{Headers, ContentLength, TransferEncoding};
use http::{self, Incoming, HttpReader};
use http::HttpReader::{SizedReader, ChunkedReader, EmptyReader};
use http::h1::{self, Incoming, HttpReader};
use http::h1::HttpReader::{SizedReader, ChunkedReader, EmptyReader};
use uri::RequestUri;
/// A request bundles several parts of an incoming `NetworkStream`, given to a `Handler`.
@@ -36,7 +36,7 @@ impl<'a, 'b: 'a> Request<'a, 'b> {
pub fn new(mut stream: &'a mut BufReader<&'b mut NetworkStream>, addr: SocketAddr)
-> ::Result<Request<'a, 'b>> {
let Incoming { version, subject: (method, uri), headers } = try!(http::parse_request(stream));
let Incoming { version, subject: (method, uri), headers } = try!(h1::parse_request(stream));
debug!("Request Line: {:?} {:?} {:?}", method, uri, version);
debug!("{:?}", headers);

View File

@@ -11,8 +11,8 @@ use std::ptr;
use time::now_utc;
use header;
use http::{CR, LF, LINE_ENDING, HttpWriter};
use http::HttpWriter::{ThroughWriter, ChunkedWriter, SizedWriter};
use http::h1::{CR, LF, LINE_ENDING, HttpWriter};
use http::h1::HttpWriter::{ThroughWriter, ChunkedWriter, SizedWriter};
use status;
use net::{Fresh, Streaming};
use version;