Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2236 insertions, 0 deletions

diff --git a/third_party/rust/httparse/src/lib.rs b/third_party/rust/httparse/src/lib.rs
new file mode 100644
index 0000000000..7153de5eb6
--- /dev/null
+++ b/third_party/rust/httparse/src/lib.rs
@@ -0,0 +1,2236 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+#![deny(missing_docs)]
+#![cfg_attr(test, deny(warnings))]
+
+//! # httparse
+//!
+//! A push library for parsing HTTP/1.x requests and responses.
+//!
+//! The focus is on speed and safety. Unsafe code is used to keep parsing fast,
+//! but unsafety is contained in a submodule, with invariants enforced. The
+//! parsing internals use an `Iterator` instead of direct indexing, while
+//! skipping bounds checks.
+//!
+//! With Rust 1.27.0 or later, support for SIMD is enabled automatically.
+//! If building an executable to be run on multiple platforms, and thus
+//! not passing `target_feature` or `target_cpu` flags to the compiler,
+//! runtime detection can still detect SSE4.2 or AVX2 support to provide
+//! massive wins.
+//!
+//! If compiling for a specific target, remembering to include
+//! `-C target_cpu=native` allows the detection to become compile time checks,
+//! making it *even* faster.
+
+use core::{fmt, result, str};
+use core::mem::{self, MaybeUninit};
+
+use crate::iter::Bytes;
+
+mod iter;
+#[macro_use] mod macros;
+mod simd;
+
+/// Determines if byte is a token char.
+///
+/// > ```notrust
+/// > token          = 1*tchar
+/// >
+/// > tchar          = "!" / "#" / "$" / "%" / "&" / "'" / "*"
+/// >                / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
+/// >                / DIGIT / ALPHA
+/// >                ; any VCHAR, except delimiters
+/// > ```
+#[inline]
+fn is_token(b: u8) -> bool {
+    b > 0x1F && b < 0x7F
+}
+
+// ASCII codes to accept URI string.
+// i.e. A-Z a-z 0-9 !#$%&'*+-._();:@=,/?[]~^
+// TODO: Make a stricter checking for URI string?
+static URI_MAP: [bool; 256] = byte_map![
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+//  \0                            \n
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+//  commands
+    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//  \w !  "  #  $  %  &  '  (  )  *  +  ,  -  .  /
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1,
+//  0  1  2  3  4  5  6  7  8  9  :  ;  <  =  >  ?
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//  @  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//  P  Q  R  S  T  U  V  W  X  Y  Z  [  \  ]  ^  _
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//  `  a  b  c  d  e  f  g  h  i  j  k  l  m  n  o
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
+//  p  q  r  s  t  u  v  w  x  y  z  {  |  }  ~  del
+//   ====== Extended ASCII (aka. obs-text) ======
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+];
+
+#[inline]
+fn is_uri_token(b: u8) -> bool {
+    URI_MAP[b as usize]
+}
+
+static HEADER_NAME_MAP: [bool; 256] = byte_map![
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
+    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+];
+
+#[inline]
+fn is_header_name_token(b: u8) -> bool {
+    HEADER_NAME_MAP[b as usize]
+}
+
+static HEADER_VALUE_MAP: [bool; 256] = byte_map![
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+];
+
+
+#[inline]
+fn is_header_value_token(b: u8) -> bool {
+    HEADER_VALUE_MAP[b as usize]
+}
+
+/// An error in parsing.
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+pub enum Error {
+    /// Invalid byte in header name.
+    HeaderName,
+    /// Invalid byte in header value.
+    HeaderValue,
+    /// Invalid byte in new line.
+    NewLine,
+    /// Invalid byte in Response status.
+    Status,
+    /// Invalid byte where token is required.
+    Token,
+    /// Parsed more headers than provided buffer can contain.
+    TooManyHeaders,
+    /// Invalid byte in HTTP version.
+    Version,
+}
+
+impl Error {
+    #[inline]
+    fn description_str(&self) -> &'static str {
+        match *self {
+            Error::HeaderName => "invalid header name",
+            Error::HeaderValue => "invalid header value",
+            Error::NewLine => "invalid new line",
+            Error::Status => "invalid response status",
+            Error::Token => "invalid token",
+            Error::TooManyHeaders => "too many headers",
+            Error::Version => "invalid HTTP version",
+        }
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(self.description_str())
+    }
+}
+
+#[cfg(feature = "std")]
+impl std::error::Error for Error {
+    fn description(&self) -> &str {
+        self.description_str()
+    }
+}
+
+/// An error in parsing a chunk size.
+// Note: Move this into the error enum once v2.0 is released.
+#[derive(Debug, PartialEq, Eq)]
+pub struct InvalidChunkSize;
+
+impl fmt::Display for InvalidChunkSize {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str("invalid chunk size")
+    }
+}
+
+/// A Result of any parsing action.
+///
+/// If the input is invalid, an `Error` will be returned. Note that incomplete
+/// data is not considered invalid, and so will not return an error, but rather
+/// a `Ok(Status::Partial)`.
+pub type Result<T> = result::Result<Status<T>, Error>;
+
+/// The result of a successful parse pass.
+///
+/// `Complete` is used when the buffer contained the complete value.
+/// `Partial` is used when parsing did not reach the end of the expected value,
+/// but no invalid data was found.
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+pub enum Status<T> {
+    /// The completed result.
+    Complete(T),
+    /// A partial result.
+    Partial
+}
+
+impl<T> Status<T> {
+    /// Convenience method to check if status is complete.
+    #[inline]
+    pub fn is_complete(&self) -> bool {
+        match *self {
+            Status::Complete(..) => true,
+            Status::Partial => false
+        }
+    }
+
+    /// Convenience method to check if status is partial.
+    #[inline]
+    pub fn is_partial(&self) -> bool {
+        match *self {
+            Status::Complete(..) => false,
+            Status::Partial => true
+        }
+    }
+
+    /// Convenience method to unwrap a Complete value. Panics if the status is
+    /// `Partial`.
+    #[inline]
+    pub fn unwrap(self) -> T {
+        match self {
+            Status::Complete(t) => t,
+            Status::Partial => panic!("Tried to unwrap Status::Partial")
+        }
+    }
+}
+
+/// Parser configuration.
+#[derive(Clone, Debug, Default)]
+pub struct ParserConfig {
+    allow_spaces_after_header_name_in_responses: bool,
+    allow_obsolete_multiline_headers_in_responses: bool,
+    allow_multiple_spaces_in_request_line_delimiters: bool,
+    allow_multiple_spaces_in_response_status_delimiters: bool,
+    ignore_invalid_headers_in_responses: bool,
+}
+
+impl ParserConfig {
+    /// Sets whether spaces and tabs should be allowed after header names in responses.
+    pub fn allow_spaces_after_header_name_in_responses(
+        &mut self,
+        value: bool,
+    ) -> &mut Self {
+        self.allow_spaces_after_header_name_in_responses = value;
+        self
+    }
+
+    /// Sets whether multiple spaces are allowed as delimiters in request lines.
+    ///
+    /// # Background
+    ///
+    /// The [latest version of the HTTP/1.1 spec][spec] allows implementations to parse multiple
+    /// whitespace characters in place of the `SP` delimiters in the request line, including:
+    ///
+    /// > SP, HTAB, VT (%x0B), FF (%x0C), or bare CR
+    ///
+    /// This option relaxes the parser to allow for multiple spaces, but does *not* allow the
+    /// request line to contain the other mentioned whitespace characters.
+    ///
+    /// [spec]: https://httpwg.org/http-core/draft-ietf-httpbis-messaging-latest.html#rfc.section.3.p.3
+    pub fn allow_multiple_spaces_in_request_line_delimiters(&mut self, value: bool) -> &mut Self {
+        self.allow_multiple_spaces_in_request_line_delimiters = value;
+        self
+    }
+
+    /// Whether multiple spaces are allowed as delimiters in request lines.
+    pub fn multiple_spaces_in_request_line_delimiters_are_allowed(&self) -> bool {
+        self.allow_multiple_spaces_in_request_line_delimiters
+    }
+
+    /// Sets whether multiple spaces are allowed as delimiters in response status lines.
+    ///
+    /// # Background
+    ///
+    /// The [latest version of the HTTP/1.1 spec][spec] allows implementations to parse multiple
+    /// whitespace characters in place of the `SP` delimiters in the response status line,
+    /// including:
+    ///
+    /// > SP, HTAB, VT (%x0B), FF (%x0C), or bare CR
+    ///
+    /// This option relaxes the parser to allow for multiple spaces, but does *not* allow the status
+    /// line to contain the other mentioned whitespace characters.
+    ///
+    /// [spec]: https://httpwg.org/http-core/draft-ietf-httpbis-messaging-latest.html#rfc.section.4.p.3
+    pub fn allow_multiple_spaces_in_response_status_delimiters(&mut self, value: bool) -> &mut Self {
+        self.allow_multiple_spaces_in_response_status_delimiters = value;
+        self
+    }
+
+    /// Whether multiple spaces are allowed as delimiters in response status lines.
+    pub fn multiple_spaces_in_response_status_delimiters_are_allowed(&self) -> bool {
+        self.allow_multiple_spaces_in_response_status_delimiters
+    }
+
+    /// Sets whether obsolete multiline headers should be allowed.
+    ///
+    /// This is an obsolete part of HTTP/1. Use at your own risk. If you are
+    /// building an HTTP library, the newlines (`\r` and `\n`) should be
+    /// replaced by spaces before handing the header value to the user.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// let buf = b"HTTP/1.1 200 OK\r\nFolded-Header: hello\r\n there \r\n\r\n";
+    /// let mut headers = [httparse::EMPTY_HEADER; 16];
+    /// let mut response = httparse::Response::new(&mut headers);
+    ///
+    /// let res = httparse::ParserConfig::default()
+    ///     .allow_obsolete_multiline_headers_in_responses(true)
+    ///     .parse_response(&mut response, buf);
+    ///
+    /// assert_eq!(res, Ok(httparse::Status::Complete(buf.len())));
+    ///
+    /// assert_eq!(response.headers.len(), 1);
+    /// assert_eq!(response.headers[0].name, "Folded-Header");
+    /// assert_eq!(response.headers[0].value, b"hello\r\n there");
+    /// ```
+    pub fn allow_obsolete_multiline_headers_in_responses(
+        &mut self,
+        value: bool,
+    ) -> &mut Self {
+        self.allow_obsolete_multiline_headers_in_responses = value;
+        self
+    }
+
+    /// Whether obsolete multiline headers should be allowed.
+    pub fn obsolete_multiline_headers_in_responses_are_allowed(&self) -> bool {
+        self.allow_obsolete_multiline_headers_in_responses
+    }
+
+    /// Parses a request with the given config.
+    pub fn parse_request<'headers, 'buf>(
+        &self,
+        request: &mut Request<'headers, 'buf>,
+        buf: &'buf [u8],
+    ) -> Result<usize> {
+        request.parse_with_config(buf, self)
+    }
+
+    /// Parses a request with the given config and buffer for headers
+    pub fn parse_request_with_uninit_headers<'headers, 'buf>(
+        &self,
+        request: &mut Request<'headers, 'buf>,
+        buf: &'buf [u8],
+        headers: &'headers mut [MaybeUninit<Header<'buf>>],
+    ) -> Result<usize> {
+        request.parse_with_config_and_uninit_headers(buf, self, headers)
+    }
+
+    /// Sets whether invalid header lines should be silently ignored in responses.
+    ///
+    /// This mimicks the behaviour of major browsers. You probably don't want this.
+    /// You should only want this if you are implementing a proxy whose main
+    /// purpose is to sit in front of browsers whose users access arbitrary content
+    /// which may be malformed, and they expect everything that works without
+    /// the proxy to keep working with the proxy.
+    ///
+    /// This option will prevent `ParserConfig::parse_response` from returning
+    /// an error encountered when parsing a header, except if the error was caused
+    /// by the character NUL (ASCII code 0), as Chrome specifically always reject
+    /// those, or if the error was caused by a lone character `\r`, as Firefox and
+    /// Chrome behave differently in that case.
+    ///
+    /// The ignorable errors are:
+    /// * empty header names;
+    /// * characters that are not allowed in header names, except for `\0` and `\r`;
+    /// * when `allow_spaces_after_header_name_in_responses` is not enabled,
+    ///   spaces and tabs between the header name and the colon;
+    /// * missing colon between header name and value;
+    /// * when `allow_obsolete_multiline_headers_in_responses` is not enabled,
+    ///   headers using obsolete line folding.
+    /// * characters that are not allowed in header values except for `\0` and `\r`.
+    ///
+    /// If an ignorable error is encountered, the parser tries to find the next
+    /// line in the input to resume parsing the rest of the headers. As lines
+    /// contributing to a header using obsolete line folding always start
+    /// with whitespace, those will be ignored too. An error will be emitted
+    /// nonetheless if it finds `\0` or a lone `\r` while looking for the
+    /// next line.
+    pub fn ignore_invalid_headers_in_responses(
+        &mut self,
+        value: bool,
+    ) -> &mut Self {
+        self.ignore_invalid_headers_in_responses = value;
+        self
+    }
+
+    /// Parses a response with the given config.
+    pub fn parse_response<'headers, 'buf>(
+        &self,
+        response: &mut Response<'headers, 'buf>,
+        buf: &'buf [u8],
+    ) -> Result<usize> {
+        response.parse_with_config(buf, self)
+    }
+
+    /// Parses a response with the given config and buffer for headers
+    pub fn parse_response_with_uninit_headers<'headers, 'buf>(
+        &self,
+        response: &mut Response<'headers, 'buf>,
+        buf: &'buf [u8],
+        headers: &'headers mut [MaybeUninit<Header<'buf>>],
+    ) -> Result<usize> {
+        response.parse_with_config_and_uninit_headers(buf, self, headers)
+    }
+}
+
+/// A parsed Request.
+///
+/// The optional values will be `None` if a parse was not complete, and did not
+/// parse the associated property. This allows you to inspect the parts that
+/// could be parsed, before reading more, in case you wish to exit early.
+///
+/// # Example
+///
+/// ```no_run
+/// let buf = b"GET /404 HTTP/1.1\r\nHost:";
+/// let mut headers = [httparse::EMPTY_HEADER; 16];
+/// let mut req = httparse::Request::new(&mut headers);
+/// let res = req.parse(buf).unwrap();
+/// if res.is_partial() {
+///     match req.path {
+///         Some(ref path) => {
+///             // check router for path.
+///             // /404 doesn't exist? we could stop parsing
+///         },
+///         None => {
+///             // must read more and parse again
+///         }
+///     }
+/// }
+/// ```
+#[derive(Debug, Eq, PartialEq)]
+pub struct Request<'headers, 'buf> {
+    /// The request method, such as `GET`.
+    pub method: Option<&'buf str>,
+    /// The request path, such as `/about-us`.
+    pub path: Option<&'buf str>,
+    /// The request minor version, such as `1` for `HTTP/1.1`.
+    pub version: Option<u8>,
+    /// The request headers.
+    pub headers: &'headers mut [Header<'buf>]
+}
+
+impl<'h, 'b> Request<'h, 'b> {
+    /// Creates a new Request, using a slice of headers you allocate.
+    #[inline]
+    pub fn new(headers: &'h mut [Header<'b>]) -> Request<'h, 'b> {
+        Request {
+            method: None,
+            path: None,
+            version: None,
+            headers,
+        }
+    }
+
+    fn parse_with_config_and_uninit_headers(
+        &mut self,
+        buf: &'b [u8],
+        config: &ParserConfig,
+        mut headers: &'h mut [MaybeUninit<Header<'b>>],
+    ) -> Result<usize> {
+        let orig_len = buf.len();
+        let mut bytes = Bytes::new(buf);
+        complete!(skip_empty_lines(&mut bytes));
+        const GET: [u8; 4] = *b"GET ";
+        const POST: [u8; 4] = *b"POST";
+        let method = match bytes.peek_n::<[u8; 4]>(4) {
+            Some(GET) => {
+                unsafe {
+                    bytes.advance_and_commit(4);
+                }
+                "GET"
+            }
+            Some(POST) if bytes.peek_ahead(4) == Some(b' ') => {
+                unsafe {
+                    bytes.advance_and_commit(5);
+                }
+                "POST"
+            }
+            _ => complete!(parse_token(&mut bytes)),
+        };
+        self.method = Some(method);
+        if config.allow_multiple_spaces_in_request_line_delimiters {
+            complete!(skip_spaces(&mut bytes));
+        }
+        self.path = Some(complete!(parse_uri(&mut bytes)));
+        if config.allow_multiple_spaces_in_request_line_delimiters {
+            complete!(skip_spaces(&mut bytes));
+        }
+        self.version = Some(complete!(parse_version(&mut bytes)));
+        newline!(bytes);
+
+        let len = orig_len - bytes.len();
+        let headers_len = complete!(parse_headers_iter_uninit(
+            &mut headers,
+            &mut bytes,
+            &ParserConfig::default(),
+        ));
+        /* SAFETY: see `parse_headers_iter_uninit` guarantees */
+        self.headers = unsafe { assume_init_slice(headers) };
+
+        Ok(Status::Complete(len + headers_len))
+    }
+
+    /// Try to parse a buffer of bytes into the Request,
+    /// except use an uninitialized slice of `Header`s.
+    ///
+    /// For more information, see `parse`
+    pub fn parse_with_uninit_headers(
+        &mut self,
+        buf: &'b [u8],
+        headers: &'h mut [MaybeUninit<Header<'b>>],
+    ) -> Result<usize> {
+        self.parse_with_config_and_uninit_headers(buf, &Default::default(), headers)
+    }
+
+    fn parse_with_config(&mut self, buf: &'b [u8], config: &ParserConfig) -> Result<usize> {
+        let headers = mem::replace(&mut self.headers, &mut []);
+
+        /* SAFETY: see `parse_headers_iter_uninit` guarantees */
+        unsafe {
+            let headers: *mut [Header<'_>] = headers;
+            let headers = headers as *mut [MaybeUninit<Header<'_>>];
+            match self.parse_with_config_and_uninit_headers(buf, config, &mut *headers) {
+                Ok(Status::Complete(idx)) => Ok(Status::Complete(idx)),
+                other => {
+                    // put the original headers back
+                    self.headers = &mut *(headers as *mut [Header<'_>]);
+                    other
+                },
+            }
+        }
+    }
+
+    /// Try to parse a buffer of bytes into the Request.
+    ///
+    /// Returns byte offset in `buf` to start of HTTP body.
+    pub fn parse(&mut self, buf: &'b [u8]) -> Result<usize> {
+        self.parse_with_config(buf, &Default::default())
+    }
+}
+
+#[inline]
+fn skip_empty_lines(bytes: &mut Bytes<'_>) -> Result<()> {
+    loop {
+        let b = bytes.peek();
+        match b {
+            Some(b'\r') => {
+                // there's `\r`, so it's safe to bump 1 pos
+                unsafe { bytes.bump() };
+                expect!(bytes.next() == b'\n' => Err(Error::NewLine));
+            },
+            Some(b'\n') => {
+                // there's `\n`, so it's safe to bump 1 pos
+                unsafe { bytes.bump(); }
+            },
+            Some(..) => {
+                bytes.slice();
+                return Ok(Status::Complete(()));
+            },
+            None => return Ok(Status::Partial)
+        }
+    }
+}
+
+#[inline]
+fn skip_spaces(bytes: &mut Bytes<'_>) -> Result<()> {
+    loop {
+        let b = bytes.peek();
+        match b {
+            Some(b' ') => {
+                // there's ` `, so it's safe to bump 1 pos
+                unsafe { bytes.bump() };
+            }
+            Some(..) => {
+                bytes.slice();
+                return Ok(Status::Complete(()));
+            }
+            None => return Ok(Status::Partial),
+        }
+    }
+}
+
+/// A parsed Response.
+///
+/// See `Request` docs for explanation of optional values.
+#[derive(Debug, Eq, PartialEq)]
+pub struct Response<'headers, 'buf> {
+    /// The response minor version, such as `1` for `HTTP/1.1`.
+    pub version: Option<u8>,
+    /// The response code, such as `200`.
+    pub code: Option<u16>,
+    /// The response reason-phrase, such as `OK`.
+    ///
+    /// Contains an empty string if the reason-phrase was missing or contained invalid characters.
+    pub reason: Option<&'buf str>,
+    /// The response headers.
+    pub headers: &'headers mut [Header<'buf>]
+}
+
+impl<'h, 'b> Response<'h, 'b> {
+    /// Creates a new `Response` using a slice of `Header`s you have allocated.
+    #[inline]
+    pub fn new(headers: &'h mut [Header<'b>]) -> Response<'h, 'b> {
+        Response {
+            version: None,
+            code: None,
+            reason: None,
+            headers,
+        }
+    }
+
+    /// Try to parse a buffer of bytes into this `Response`.
+    pub fn parse(&mut self, buf: &'b [u8]) -> Result<usize> {
+        self.parse_with_config(buf, &ParserConfig::default())
+    }
+
+    fn parse_with_config(&mut self, buf: &'b [u8], config: &ParserConfig) -> Result<usize> {
+        let headers = mem::replace(&mut self.headers, &mut []);
+
+        unsafe {
+            let headers: *mut [Header<'_>] = headers;
+            let headers = headers as *mut [MaybeUninit<Header<'_>>];
+            match self.parse_with_config_and_uninit_headers(buf, config, &mut *headers) {
+                Ok(Status::Complete(idx)) => Ok(Status::Complete(idx)),
+                other => {
+                    // put the original headers back
+                    self.headers = &mut *(headers as *mut [Header<'_>]);
+                    other
+                },
+            }
+        }
+    }
+
+    fn parse_with_config_and_uninit_headers(
+        &mut self,
+        buf: &'b [u8],
+        config: &ParserConfig,
+        mut headers: &'h mut [MaybeUninit<Header<'b>>],
+    ) -> Result<usize> {
+        let orig_len = buf.len();
+        let mut bytes = Bytes::new(buf);
+
+        complete!(skip_empty_lines(&mut bytes));
+        self.version = Some(complete!(parse_version(&mut bytes)));
+        space!(bytes or Error::Version);
+        if config.allow_multiple_spaces_in_response_status_delimiters {
+            complete!(skip_spaces(&mut bytes));
+        }
+        self.code = Some(complete!(parse_code(&mut bytes)));
+
+        // RFC7230 says there must be 'SP' and then reason-phrase, but admits
+        // its only for legacy reasons. With the reason-phrase completely
+        // optional (and preferred to be omitted) in HTTP2, we'll just
+        // handle any response that doesn't include a reason-phrase, because
+        // it's more lenient, and we don't care anyways.
+        //
+        // So, a SP means parse a reason-phrase.
+        // A newline means go to headers.
+        // Anything else we'll say is a malformed status.
+        match next!(bytes) {
+            b' ' => {
+                if config.allow_multiple_spaces_in_response_status_delimiters {
+                    complete!(skip_spaces(&mut bytes));
+                }
+                bytes.slice();
+                self.reason = Some(complete!(parse_reason(&mut bytes)));
+            },
+            b'\r' => {
+                expect!(bytes.next() == b'\n' => Err(Error::Status));
+                bytes.slice();
+                self.reason = Some("");
+            },
+            b'\n' => {
+                bytes.slice();
+                self.reason = Some("");
+            }
+            _ => return Err(Error::Status),
+        }
+
+
+        let len = orig_len - bytes.len();
+        let headers_len = complete!(parse_headers_iter_uninit(
+            &mut headers,
+            &mut bytes,
+            config
+        ));
+        /* SAFETY: see `parse_headers_iter_uninit` guarantees */
+        self.headers = unsafe { assume_init_slice(headers) };
+        Ok(Status::Complete(len + headers_len))
+    }
+}
+
+/// Represents a parsed header.
+#[derive(Copy, Clone, Eq, PartialEq)]
+pub struct Header<'a> {
+    /// The name portion of a header.
+    ///
+    /// A header name must be valid ASCII-US, so it's safe to store as a `&str`.
+    pub name: &'a str,
+    /// The value portion of a header.
+    ///
+    /// While headers **should** be ASCII-US, the specification allows for
+    /// values that may not be, and so the value is stored as bytes.
+    pub value: &'a [u8],
+}
+
+impl<'a> fmt::Debug for Header<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut f = f.debug_struct("Header");
+        f.field("name", &self.name);
+        if let Ok(value) = str::from_utf8(self.value) {
+            f.field("value", &value);
+        } else {
+            f.field("value", &self.value);
+        }
+        f.finish()
+    }
+}
+
+/// An empty header, useful for constructing a `Header` array to pass in for
+/// parsing.
+///
+/// # Example
+///
+/// ```
+/// let headers = [httparse::EMPTY_HEADER; 64];
+/// ```
+pub const EMPTY_HEADER: Header<'static> = Header { name: "", value: b"" };
+
+#[inline]
+fn parse_version(bytes: &mut Bytes<'_>) -> Result<u8> {
+    if let Some(eight) = bytes.peek_n::<[u8; 8]>(8) {
+        unsafe { bytes.advance(8); }
+        return match &eight {
+            b"HTTP/1.0" => Ok(Status::Complete(0)),
+            b"HTTP/1.1" => Ok(Status::Complete(1)),
+            _ => Err(Error::Version),
+        }
+    }
+
+    // else (but not in `else` because of borrow checker)
+
+    // If there aren't at least 8 bytes, we still want to detect early
+    // if this is a valid version or not. If it is, we'll return Partial.
+    expect!(bytes.next() == b'H' => Err(Error::Version));
+    expect!(bytes.next() == b'T' => Err(Error::Version));
+    expect!(bytes.next() == b'T' => Err(Error::Version));
+    expect!(bytes.next() == b'P' => Err(Error::Version));
+    expect!(bytes.next() == b'/' => Err(Error::Version));
+    expect!(bytes.next() == b'1' => Err(Error::Version));
+    expect!(bytes.next() == b'.' => Err(Error::Version));
+    Ok(Status::Partial)
+}
+
+/// From [RFC 7230](https://tools.ietf.org/html/rfc7230):
+///
+/// > ```notrust
+/// > reason-phrase  = *( HTAB / SP / VCHAR / obs-text )
+/// > HTAB           = %x09        ; horizontal tab
+/// > VCHAR          = %x21-7E     ; visible (printing) characters
+/// > obs-text       = %x80-FF
+/// > ```
+///
+/// > A.2.  Changes from RFC 2616
+/// >
+/// > Non-US-ASCII content in header fields and the reason phrase
+/// > has been obsoleted and made opaque (the TEXT rule was removed).
+#[inline]
+fn parse_reason<'a>(bytes: &mut Bytes<'a>) -> Result<&'a str> {
+    let mut seen_obs_text = false;
+    loop {
+        let b = next!(bytes);
+        if b == b'\r' {
+            expect!(bytes.next() == b'\n' => Err(Error::Status));
+            return Ok(Status::Complete(unsafe {
+                let bytes = bytes.slice_skip(2);
+                if !seen_obs_text {
+                    // all bytes up till `i` must have been HTAB / SP / VCHAR
+                    str::from_utf8_unchecked(bytes)
+                } else {
+                    // obs-text characters were found, so return the fallback empty string
+                    ""
+                }
+            }));
+        } else if b == b'\n' {
+            return Ok(Status::Complete(unsafe {
+                let bytes = bytes.slice_skip(1);
+                if !seen_obs_text {
+                    // all bytes up till `i` must have been HTAB / SP / VCHAR
+                    str::from_utf8_unchecked(bytes)
+                } else {
+                    // obs-text characters were found, so return the fallback empty string
+                    ""
+                }
+            }));
+        } else if !(b == 0x09 || b == b' ' || (0x21..=0x7E).contains(&b) || b >= 0x80) {
+            return Err(Error::Status);
+        } else if b >= 0x80 {
+            seen_obs_text = true;
+        }
+    }
+}
+
+#[inline]
+fn parse_token<'a>(bytes: &mut Bytes<'a>) -> Result<&'a str> {
+    let b = next!(bytes);
+    if !is_token(b) {
+        // First char must be a token char, it can't be a space which would indicate an empty token.
+        return Err(Error::Token);
+    }
+
+    loop {
+        let b = next!(bytes);
+        if b == b' ' {
+            return Ok(Status::Complete(unsafe {
+                // all bytes up till `i` must have been `is_token`.
+                str::from_utf8_unchecked(bytes.slice_skip(1))
+            }));
+        } else if !is_token(b) {
+            return Err(Error::Token);
+        }
+    }
+}
+
+#[inline]
+fn parse_uri<'a>(bytes: &mut Bytes<'a>) -> Result<&'a str> {
+    let b = next!(bytes);
+    if !is_uri_token(b) {
+        // First char must be a URI char, it can't be a space which would indicate an empty path.
+        return Err(Error::Token);
+    }
+
+    simd::match_uri_vectored(bytes);
+
+    loop {
+        let b = next!(bytes);
+        if b == b' ' {
+            return Ok(Status::Complete(unsafe {
+                // all bytes up till `i` must have been `is_token`.
+                str::from_utf8_unchecked(bytes.slice_skip(1))
+            }));
+        } else if !is_uri_token(b) {
+            return Err(Error::Token);
+        }
+    }
+}
+
+
+#[inline]
+fn parse_code(bytes: &mut Bytes<'_>) -> Result<u16> {
+    let hundreds = expect!(bytes.next() == b'0'..=b'9' => Err(Error::Status));
+    let tens = expect!(bytes.next() == b'0'..=b'9' => Err(Error::Status));
+    let ones = expect!(bytes.next() == b'0'..=b'9' => Err(Error::Status));
+
+    Ok(Status::Complete((hundreds - b'0') as u16 * 100 +
+        (tens - b'0') as u16 * 10 +
+        (ones - b'0') as u16))
+}
+
+/// Parse a buffer of bytes as headers.
+///
+/// The return value, if complete and successful, includes the index of the
+/// buffer that parsing stopped at, and a sliced reference to the parsed
+/// headers. The length of the slice will be equal to the number of properly
+/// parsed headers.
+///
+/// # Example
+///
+/// ```
+/// let buf = b"Host: foo.bar\nAccept: */*\n\nblah blah";
+/// let mut headers = [httparse::EMPTY_HEADER; 4];
+/// assert_eq!(httparse::parse_headers(buf, &mut headers),
+///            Ok(httparse::Status::Complete((27, &[
+///                httparse::Header { name: "Host", value: b"foo.bar" },
+///                httparse::Header { name: "Accept", value: b"*/*" }
+///            ][..]))));
+/// ```
+pub fn parse_headers<'b: 'h, 'h>(
+    src: &'b [u8],
+    mut dst: &'h mut [Header<'b>],
+) -> Result<(usize, &'h [Header<'b>])> {
+    let mut iter = Bytes::new(src);
+    let pos = complete!(parse_headers_iter(&mut dst, &mut iter, &ParserConfig::default()));
+    Ok(Status::Complete((pos, dst)))
+}
+
+#[inline]
+fn parse_headers_iter<'a, 'b>(
+    headers: &mut &mut [Header<'a>],
+    bytes: &'b mut Bytes<'a>,
+    config: &ParserConfig,
+) -> Result<usize> {
+    parse_headers_iter_uninit(
+        /* SAFETY: see `parse_headers_iter_uninit` guarantees */
+        unsafe { deinit_slice_mut(headers) },
+        bytes,
+        config,
+    )
+}
+
+unsafe fn deinit_slice_mut<'a, 'b, T>(s: &'a mut &'b mut [T]) -> &'a mut &'b mut [MaybeUninit<T>] {
+    let s: *mut &mut [T] = s;
+    let s = s as *mut &mut [MaybeUninit<T>];
+    &mut *s
+}
+unsafe fn assume_init_slice<T>(s: &mut [MaybeUninit<T>]) -> &mut [T] {
+    let s: *mut [MaybeUninit<T>] = s;
+    let s = s as *mut [T];
+    &mut *s
+}
+
+/* Function which parsers headers into uninitialized buffer.
+ *
+ * Guarantees that it doesn't write garbage, so casting
+ * &mut &mut [Header] -> &mut &mut [MaybeUninit<Header>]
+ * is safe here.
+ *
+ * Also it promises `headers` get shrunk to number of initialized headers,
+ * so casting the other way around after calling this function is safe
+ */
+fn parse_headers_iter_uninit<'a, 'b>(
+    headers: &mut &mut [MaybeUninit<Header<'a>>],
+    bytes: &'b mut Bytes<'a>,
+    config: &ParserConfig,
+) -> Result<usize> {
+
+    /* Flow of this function is pretty complex, especially with macros,
+     * so this struct makes sure we shrink `headers` to only parsed ones.
+     * Comparing to previous code, this only may introduce some additional
+     * instructions in case of early return */
+    struct ShrinkOnDrop<'r1, 'r2, 'a> {
+        headers: &'r1 mut &'r2 mut [MaybeUninit<Header<'a>>],
+        num_headers: usize,
+    }
+
+    impl<'r1, 'r2, 'a> Drop for ShrinkOnDrop<'r1, 'r2, 'a> {
+        fn drop(&mut self) {
+            let headers = mem::replace(self.headers, &mut []);
+
+            /* SAFETY: num_headers is the number of initialized headers */
+            let headers = unsafe { headers.get_unchecked_mut(..self.num_headers) };
+
+            *self.headers = headers;
+        }
+    }
+
+    let mut autoshrink = ShrinkOnDrop {
+        headers,
+        num_headers: 0,
+    };
+    let mut count: usize = 0;
+    let mut result = Err(Error::TooManyHeaders);
+
+    let mut iter = autoshrink.headers.iter_mut();
+
+    macro_rules! maybe_continue_after_obsolete_line_folding {
+        ($bytes:ident, $label:lifetime) => {
+            if config.allow_obsolete_multiline_headers_in_responses {
+                match $bytes.peek() {
+                    None => {
+                        // Next byte may be a space, in which case that header
+                        // is using obsolete line folding, so we may have more
+                        // whitespace to skip after colon.
+                        return Ok(Status::Partial);
+                    }
+                    Some(b' ') | Some(b'\t') => {
+                        // The space will be consumed next iteration.
+                        continue $label;
+                    }
+                    _ => {
+                        // There is another byte after the end of the line,
+                        // but it's not whitespace, so it's probably another
+                        // header or the final line return. This header is thus
+                        // empty.
+                    },
+                }
+            }
+        }
+    }
+
+    'headers: loop {
+        // Return the error `$err` if `ignore_invalid_headers_in_responses`
+        // is false, otherwise find the end of the current line and resume
+        // parsing on the next one.
+        macro_rules! handle_invalid_char {
+            ($bytes:ident, $b:ident, $err:ident) => {
+                if !config.ignore_invalid_headers_in_responses {
+                    return Err(Error::$err);
+                }
+
+                let mut b = $b;
+
+                loop {
+                    if b == b'\r' {
+                        expect!(bytes.next() == b'\n' => Err(Error::$err));
+                        break;
+                    }
+                    if b == b'\n' {
+                        break;
+                    }
+                    if b == b'\0' {
+                        return Err(Error::$err);
+                    }
+                    b = next!($bytes);
+                }
+
+                count += $bytes.pos();
+                $bytes.slice();
+
+                continue 'headers;
+            };
+        }
+
+        // a newline here means the head is over!
+        let b = next!(bytes);
+        if b == b'\r' {
+            expect!(bytes.next() == b'\n' => Err(Error::NewLine));
+            result = Ok(Status::Complete(count + bytes.pos()));
+            break;
+        }
+        if b == b'\n' {
+            result = Ok(Status::Complete(count + bytes.pos()));
+            break;
+        }
+        if !is_header_name_token(b) {
+            handle_invalid_char!(bytes, b, HeaderName);
+        }
+
+        // parse header name until colon
+        let header_name: &str = 'name: loop {
+            let mut b = next!(bytes);
+
+            if is_header_name_token(b) {
+                continue 'name;
+            }
+
+            count += bytes.pos();
+            let name = unsafe {
+                str::from_utf8_unchecked(bytes.slice_skip(1))
+            };
+
+            if b == b':' {
+                break 'name name;
+            }
+
+            if config.allow_spaces_after_header_name_in_responses {
+                while b == b' ' || b == b'\t' {
+                    b = next!(bytes);
+
+                    if b == b':' {
+                        count += bytes.pos();
+                        bytes.slice();
+                        break 'name name;
+                    }
+                }
+            }
+
+            handle_invalid_char!(bytes, b, HeaderName);
+        };
+
+        let mut b;
+
+        let value_slice = 'value: loop {
+            // eat white space between colon and value
+            'whitespace_after_colon: loop {
+                b = next!(bytes);
+                if b == b' ' || b == b'\t' {
+                    count += bytes.pos();
+                    bytes.slice();
+                    continue 'whitespace_after_colon;
+                }
+                if is_header_value_token(b) {
+                    break 'whitespace_after_colon;
+                }
+
+                if b == b'\r' {
+                    expect!(bytes.next() == b'\n' => Err(Error::HeaderValue));
+                } else if b != b'\n' {
+                    handle_invalid_char!(bytes, b, HeaderValue);
+                }
+
+                maybe_continue_after_obsolete_line_folding!(bytes, 'whitespace_after_colon);
+
+                count += bytes.pos();
+                let whitespace_slice = bytes.slice();
+
+                // This produces an empty slice that points to the beginning
+                // of the whitespace.
+                break 'value &whitespace_slice[0..0];
+            }
+
+            'value_lines: loop {
+                // parse value till EOL
+
+                simd::match_header_value_vectored(bytes);
+
+                'value_line: loop {
+                    if let Some(bytes8) = bytes.peek_n::<[u8; 8]>(8) {
+                        macro_rules! check {
+                            ($bytes:ident, $i:literal) => ({
+                                b = $bytes[$i];
+                                if !is_header_value_token(b) {
+                                    unsafe { bytes.advance($i + 1); }
+                                    break 'value_line;
+                                }
+                            });
+                        }
+
+                        check!(bytes8, 0);
+                        check!(bytes8, 1);
+                        check!(bytes8, 2);
+                        check!(bytes8, 3);
+                        check!(bytes8, 4);
+                        check!(bytes8, 5);
+                        check!(bytes8, 6);
+                        check!(bytes8, 7);
+                        unsafe { bytes.advance(8); }
+
+                        continue 'value_line;
+                    }
+
+                    b = next!(bytes);
+                    if !is_header_value_token(b) {
+                        break 'value_line;
+                    }
+                }
+
+                //found_ctl
+                let skip = if b == b'\r' {
+                    expect!(bytes.next() == b'\n' => Err(Error::HeaderValue));
+                    2
+                } else if b == b'\n' {
+                    1
+                } else {
+                    handle_invalid_char!(bytes, b, HeaderValue);
+                };
+
+                maybe_continue_after_obsolete_line_folding!(bytes, 'value_lines);
+
+                count += bytes.pos();
+                // having just checked that a newline exists, it's safe to skip it.
+                unsafe {
+                    break 'value bytes.slice_skip(skip);
+                }
+            }
+        };
+
+        let uninit_header = match iter.next() {
+            Some(header) => header,
+            None => break 'headers
+        };
+
+        // trim trailing whitespace in the header
+        let header_value = if let Some(last_visible) = value_slice
+            .iter()
+            .rposition(|b| *b != b' ' && *b != b'\t' && *b != b'\r' && *b != b'\n')
+        {
+            // There is at least one non-whitespace character.
+            &value_slice[0..last_visible+1]
+        } else {
+            // There is no non-whitespace character. This can only happen when value_slice is
+            // empty.
+            value_slice
+        };
+
+        *uninit_header = MaybeUninit::new(Header {
+            name: header_name,
+            value: header_value,
+        });
+        autoshrink.num_headers += 1;
+    }
+
+    result
+}
+
+/// Parse a buffer of bytes as a chunk size.
+///
+/// The return value, if complete and successful, includes the index of the
+/// buffer that parsing stopped at, and the size of the following chunk.
+///
+/// # Example
+///
+/// ```
+/// let buf = b"4\r\nRust\r\n0\r\n\r\n";
+/// assert_eq!(httparse::parse_chunk_size(buf),
+///            Ok(httparse::Status::Complete((3, 4))));
+/// ```
+pub fn parse_chunk_size(buf: &[u8])
+    -> result::Result<Status<(usize, u64)>, InvalidChunkSize> {
+    const RADIX: u64 = 16;
+    let mut bytes = Bytes::new(buf);
+    let mut size = 0;
+    let mut in_chunk_size = true;
+    let mut in_ext = false;
+    let mut count = 0;
+    loop {
+        let b = next!(bytes);
+        match b {
+            b'0' ..= b'9' if in_chunk_size => {
+                if count > 15 {
+                    return Err(InvalidChunkSize);
+                }
+                count += 1;
+                size *= RADIX;
+                size += (b - b'0') as u64;
+            },
+            b'a' ..= b'f' if in_chunk_size => {
+                if count > 15 {
+                    return Err(InvalidChunkSize);
+                }
+                count += 1;
+                size *= RADIX;
+                size += (b + 10 - b'a') as u64;
+            }
+            b'A' ..= b'F' if in_chunk_size => {
+                if count > 15 {
+                    return Err(InvalidChunkSize);
+                }
+                count += 1;
+                size *= RADIX;
+                size += (b + 10 - b'A') as u64;
+            }
+            b'\r' => {
+                match next!(bytes) {
+                    b'\n' => break,
+                    _ => return Err(InvalidChunkSize),
+                }
+            }
+            // If we weren't in the extension yet, the ";" signals its start
+            b';' if !in_ext => {
+                in_ext = true;
+                in_chunk_size = false;
+            }
+            // "Linear white space" is ignored between the chunk size and the
+            // extension separator token (";") due to the "implied *LWS rule".
+            b'\t' | b' ' if !in_ext && !in_chunk_size => {}
+            // LWS can follow the chunk size, but no more digits can come
+            b'\t' | b' ' if in_chunk_size => in_chunk_size = false,
+            // We allow any arbitrary octet once we are in the extension, since
+            // they all get ignored anyway. According to the HTTP spec, valid
+            // extensions would have a more strict syntax:
+            //     (token ["=" (token | quoted-string)])
+            // but we gain nothing by rejecting an otherwise valid chunk size.
+            _ if in_ext => {}
+            // Finally, if we aren't in the extension and we're reading any
+            // other octet, the chunk size line is invalid!
+            _ => return Err(InvalidChunkSize),
+        }
+    }
+    Ok(Status::Complete((bytes.pos(), size)))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{Request, Response, Status, EMPTY_HEADER, parse_chunk_size};
+
+    const NUM_OF_HEADERS: usize = 4;
+
+    macro_rules! req {
+        ($name:ident, $buf:expr, |$arg:ident| $body:expr) => (
+            req! {$name, $buf, Ok(Status::Complete($buf.len())), |$arg| $body }
+        );
+        ($name:ident, $buf:expr, $len:expr, |$arg:ident| $body:expr) => (
+        #[test]
+        fn $name() {
+            let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+            let mut req = Request::new(&mut headers[..]);
+            let status = req.parse($buf.as_ref());
+            assert_eq!(status, $len);
+            closure(req);
+
+            fn closure($arg: Request) {
+                $body
+            }
+        }
+        )
+    }
+
+    req! {
+        test_request_simple,
+        b"GET / HTTP/1.1\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 0);
+        }
+    }
+
+    req! {
+        test_request_simple_with_query_params,
+        b"GET /thing?data=a HTTP/1.1\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/thing?data=a");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 0);
+        }
+    }
+
+    req! {
+        test_request_simple_with_whatwg_query_params,
+        b"GET /thing?data=a^ HTTP/1.1\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/thing?data=a^");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 0);
+        }
+    }
+
+    req! {
+        test_request_headers,
+        b"GET / HTTP/1.1\r\nHost: foo.com\r\nCookie: \r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 2);
+            assert_eq!(req.headers[0].name, "Host");
+            assert_eq!(req.headers[0].value, b"foo.com");
+            assert_eq!(req.headers[1].name, "Cookie");
+            assert_eq!(req.headers[1].value, b"");
+        }
+    }
+
+    req! {
+        test_request_headers_optional_whitespace,
+        b"GET / HTTP/1.1\r\nHost: \tfoo.com\t \r\nCookie: \t \r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 2);
+            assert_eq!(req.headers[0].name, "Host");
+            assert_eq!(req.headers[0].value, b"foo.com");
+            assert_eq!(req.headers[1].name, "Cookie");
+            assert_eq!(req.headers[1].value, b"");
+        }
+    }
+
+    req! {
+        // test the scalar parsing
+        test_request_header_value_htab_short,
+        b"GET / HTTP/1.1\r\nUser-Agent: some\tagent\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 1);
+            assert_eq!(req.headers[0].name, "User-Agent");
+            assert_eq!(req.headers[0].value, b"some\tagent");
+        }
+    }
+
+    req! {
+        // test the sse42 parsing
+        test_request_header_value_htab_med,
+        b"GET / HTTP/1.1\r\nUser-Agent: 1234567890some\tagent\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 1);
+            assert_eq!(req.headers[0].name, "User-Agent");
+            assert_eq!(req.headers[0].value, b"1234567890some\tagent");
+        }
+    }
+
+    req! {
+        // test the avx2 parsing
+        test_request_header_value_htab_long,
+        b"GET / HTTP/1.1\r\nUser-Agent: 1234567890some\t1234567890agent1234567890\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 1);
+            assert_eq!(req.headers[0].name, "User-Agent");
+            assert_eq!(req.headers[0].value, &b"1234567890some\t1234567890agent1234567890"[..]);
+        }
+    }
+
+    req! {
+        test_request_headers_max,
+        b"GET / HTTP/1.1\r\nA: A\r\nB: B\r\nC: C\r\nD: D\r\n\r\n",
+        |req| {
+            assert_eq!(req.headers.len(), NUM_OF_HEADERS);
+        }
+    }
+
+    req! {
+        test_request_multibyte,
+        b"GET / HTTP/1.1\r\nHost: foo.com\r\nUser-Agent: \xe3\x81\xb2\xe3/1.0\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 2);
+            assert_eq!(req.headers[0].name, "Host");
+            assert_eq!(req.headers[0].value, b"foo.com");
+            assert_eq!(req.headers[1].name, "User-Agent");
+            assert_eq!(req.headers[1].value, b"\xe3\x81\xb2\xe3/1.0");
+        }
+    }
+
+
+    req! {
+        test_request_partial,
+        b"GET / HTTP/1.1\r\n\r", Ok(Status::Partial),
+        |_req| {}
+    }
+
+    req! {
+        test_request_partial_version,
+        b"GET / HTTP/1.", Ok(Status::Partial),
+        |_req| {}
+    }
+
+    req! {
+        test_request_partial_parses_headers_as_much_as_it_can,
+        b"GET / HTTP/1.1\r\nHost: yolo\r\n",
+        Ok(crate::Status::Partial),
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), NUM_OF_HEADERS); // doesn't slice since not Complete
+            assert_eq!(req.headers[0].name, "Host");
+            assert_eq!(req.headers[0].value, b"yolo");
+        }
+    }
+
+    req! {
+        test_request_newlines,
+        b"GET / HTTP/1.1\nHost: foo.bar\n\n",
+        |_r| {}
+    }
+
+    req! {
+        test_request_empty_lines_prefix,
+        b"\r\n\r\nGET / HTTP/1.1\r\n\r\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 0);
+        }
+    }
+
+    req! {
+        test_request_empty_lines_prefix_lf_only,
+        b"\n\nGET / HTTP/1.1\n\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 0);
+        }
+    }
+
+    req! {
+        test_request_path_backslash,
+        b"\n\nGET /\\?wayne\\=5 HTTP/1.1\n\n",
+        |req| {
+            assert_eq!(req.method.unwrap(), "GET");
+            assert_eq!(req.path.unwrap(), "/\\?wayne\\=5");
+            assert_eq!(req.version.unwrap(), 1);
+            assert_eq!(req.headers.len(), 0);
+        }
+    }
+
+    req! {
+        test_request_with_invalid_token_delimiter,
+        b"GET\n/ HTTP/1.1\r\nHost: foo.bar\r\n\r\n",
+        Err(crate::Error::Token),
+        |_r| {}
+    }
+
+
+    req! {
+        test_request_with_invalid_but_short_version,
+        b"GET / HTTP/1!",
+        Err(crate::Error::Version),
+        |_r| {}
+    }
+
+    req! {
+        test_request_with_empty_method,
+        b" / HTTP/1.1\r\n\r\n",
+        Err(crate::Error::Token),
+        |_r| {}
+    }
+
+    req! {
+        test_request_with_empty_path,
+        b"GET  HTTP/1.1\r\n\r\n",
+        Err(crate::Error::Token),
+        |_r| {}
+    }
+
+    req! {
+        test_request_with_empty_method_and_path,
+        b"  HTTP/1.1\r\n\r\n",
+        Err(crate::Error::Token),
+        |_r| {}
+    }
+
+    macro_rules! res {
+        ($name:ident, $buf:expr, |$arg:ident| $body:expr) => (
+            res! {$name, $buf, Ok(Status::Complete($buf.len())), |$arg| $body }
+        );
+        ($name:ident, $buf:expr, $len:expr, |$arg:ident| $body:expr) => (
+        #[test]
+        fn $name() {
+            let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+            let mut res = Response::new(&mut headers[..]);
+            let status = res.parse($buf.as_ref());
+            assert_eq!(status, $len);
+            closure(res);
+
+            fn closure($arg: Response) {
+                $body
+            }
+        }
+        )
+    }
+
+    res! {
+        test_response_simple,
+        b"HTTP/1.1 200 OK\r\n\r\n",
+        |res| {
+            assert_eq!(res.version.unwrap(), 1);
+            assert_eq!(res.code.unwrap(), 200);
+            assert_eq!(res.reason.unwrap(), "OK");
+        }
+    }
+
+    res! {
+        test_response_newlines,
+        b"HTTP/1.0 403 Forbidden\nServer: foo.bar\n\n",
+        |_r| {}
+    }
+
+    res! {
+        test_response_reason_missing,
+        b"HTTP/1.1 200 \r\n\r\n",
+        |res| {
+            assert_eq!(res.version.unwrap(), 1);
+            assert_eq!(res.code.unwrap(), 200);
+            assert_eq!(res.reason.unwrap(), "");
+        }
+    }
+
+    res! {
+        test_response_reason_missing_no_space,
+        b"HTTP/1.1 200\r\n\r\n",
+        |res| {
+            assert_eq!(res.version.unwrap(), 1);
+            assert_eq!(res.code.unwrap(), 200);
+            assert_eq!(res.reason.unwrap(), "");
+        }
+    }
+
+    res! {
+        test_response_reason_missing_no_space_with_headers,
+        b"HTTP/1.1 200\r\nFoo: bar\r\n\r\n",
+        |res| {
+            assert_eq!(res.version.unwrap(), 1);
+            assert_eq!(res.code.unwrap(), 200);
+            assert_eq!(res.reason.unwrap(), "");
+            assert_eq!(res.headers.len(), 1);
+            assert_eq!(res.headers[0].name, "Foo");
+            assert_eq!(res.headers[0].value, b"bar");
+        }
+    }
+
+    res! {
+        test_response_reason_with_space_and_tab,
+        b"HTTP/1.1 101 Switching Protocols\t\r\n\r\n",
+        |res| {
+            assert_eq!(res.version.unwrap(), 1);
+            assert_eq!(res.code.unwrap(), 101);
+            assert_eq!(res.reason.unwrap(), "Switching Protocols\t");
+        }
+    }
+
+    static RESPONSE_REASON_WITH_OBS_TEXT_BYTE: &[u8] = b"HTTP/1.1 200 X\xFFZ\r\n\r\n";
+    res! {
+        test_response_reason_with_obsolete_text_byte,
+        RESPONSE_REASON_WITH_OBS_TEXT_BYTE,
+        |res| {
+            assert_eq!(res.version.unwrap(), 1);
+            assert_eq!(res.code.unwrap(), 200);
+            // Empty string fallback in case of obs-text
+            assert_eq!(res.reason.unwrap(), "");
+        }
+    }
+
+    res! {
+        test_response_reason_with_nul_byte,
+        b"HTTP/1.1 200 \x00\r\n\r\n",
+        Err(crate::Error::Status),
+        |_res| {}
+    }
+
+    res! {
+        test_response_version_missing_space,
+        b"HTTP/1.1",
+        Ok(Status::Partial),
+        |_res| {}
+    }
+
+    res! {
+        test_response_code_missing_space,
+        b"HTTP/1.1 200",
+        Ok(Status::Partial),
+        |_res| {}
+    }
+
+    res! {
+        test_response_partial_parses_headers_as_much_as_it_can,
+        b"HTTP/1.1 200 OK\r\nServer: yolo\r\n",
+        Ok(crate::Status::Partial),
+        |res| {
+            assert_eq!(res.version.unwrap(), 1);
+            assert_eq!(res.code.unwrap(), 200);
+            assert_eq!(res.reason.unwrap(), "OK");
+            assert_eq!(res.headers.len(), NUM_OF_HEADERS); // doesn't slice since not Complete
+            assert_eq!(res.headers[0].name, "Server");
+            assert_eq!(res.headers[0].value, b"yolo");
+        }
+    }
+
+    res! {
+        test_response_empty_lines_prefix_lf_only,
+        b"\n\nHTTP/1.1 200 OK\n\n",
+        |_res| {}
+    }
+
+    res! {
+        test_response_no_cr,
+        b"HTTP/1.0 200\nContent-type: text/html\n\n",
+        |res| {
+            assert_eq!(res.version.unwrap(), 0);
+            assert_eq!(res.code.unwrap(), 200);
+            assert_eq!(res.reason.unwrap(), "");
+            assert_eq!(res.headers.len(), 1);
+            assert_eq!(res.headers[0].name, "Content-type");
+            assert_eq!(res.headers[0].value, b"text/html");
+        }
+    }
+
+    static RESPONSE_WITH_WHITESPACE_BETWEEN_HEADER_NAME_AND_COLON: &[u8] =
+        b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials : true\r\nBread: baguette\r\n\r\n";
+
+    #[test]
+    fn test_forbid_response_with_whitespace_between_header_name_and_colon() {
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+        let result = response.parse(RESPONSE_WITH_WHITESPACE_BETWEEN_HEADER_NAME_AND_COLON);
+
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_allow_response_with_whitespace_between_header_name_and_colon() {
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_spaces_after_header_name_in_responses(true)
+            .parse_response(&mut response, RESPONSE_WITH_WHITESPACE_BETWEEN_HEADER_NAME_AND_COLON);
+
+        assert_eq!(result, Ok(Status::Complete(77)));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 2);
+        assert_eq!(response.headers[0].name, "Access-Control-Allow-Credentials");
+        assert_eq!(response.headers[0].value, &b"true"[..]);
+        assert_eq!(response.headers[1].name, "Bread");
+        assert_eq!(response.headers[1].value, &b"baguette"[..]);
+    }
+
+    #[test]
+    fn test_ignore_header_line_with_whitespaces_after_header_name() {
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE_WITH_WHITESPACE_BETWEEN_HEADER_NAME_AND_COLON);
+
+        assert_eq!(result, Ok(Status::Complete(77)));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Bread");
+        assert_eq!(response.headers[0].value, &b"baguette"[..]);
+    }
+
+    static REQUEST_WITH_WHITESPACE_BETWEEN_HEADER_NAME_AND_COLON: &[u8] =
+        b"GET / HTTP/1.1\r\nHost : localhost\r\n\r\n";
+
+    #[test]
+    fn test_forbid_request_with_whitespace_between_header_name_and_colon() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut request = Request::new(&mut headers[..]);
+        let result = request.parse(REQUEST_WITH_WHITESPACE_BETWEEN_HEADER_NAME_AND_COLON);
+
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    static RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_START: &[u8] =
+        b"HTTP/1.1 200 OK\r\nLine-Folded-Header: \r\n   \r\n hello there\r\n\r\n";
+
+    #[test]
+    fn test_forbid_response_with_obsolete_line_folding_at_start() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = response.parse(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_START);
+
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_allow_response_with_obsolete_line_folding_at_start() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_obsolete_multiline_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_START);
+
+        assert_eq!(result, Ok(Status::Complete(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_START.len())));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Line-Folded-Header");
+        assert_eq!(response.headers[0].value, &b"hello there"[..]);
+    }
+
+    static RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_END: &[u8] =
+        b"HTTP/1.1 200 OK\r\nLine-Folded-Header: hello there\r\n   \r\n \r\n\r\n";
+
+    #[test]
+    fn test_forbid_response_with_obsolete_line_folding_at_end() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = response.parse(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_END);
+
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_allow_response_with_obsolete_line_folding_at_end() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_obsolete_multiline_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_END);
+
+        assert_eq!(result, Ok(Status::Complete(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_AT_END.len())));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Line-Folded-Header");
+        assert_eq!(response.headers[0].value, &b"hello there"[..]);
+    }
+
+    static RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_MIDDLE: &[u8] =
+        b"HTTP/1.1 200 OK\r\nLine-Folded-Header: hello  \r\n \r\n there\r\n\r\n";
+
+    #[test]
+    fn test_forbid_response_with_obsolete_line_folding_in_middle() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = response.parse(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_MIDDLE);
+
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_allow_response_with_obsolete_line_folding_in_middle() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_obsolete_multiline_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_MIDDLE);
+
+        assert_eq!(result, Ok(Status::Complete(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_MIDDLE.len())));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Line-Folded-Header");
+        assert_eq!(response.headers[0].value, &b"hello  \r\n \r\n there"[..]);
+    }
+
+    static RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_EMPTY_HEADER: &[u8] =
+        b"HTTP/1.1 200 OK\r\nLine-Folded-Header:   \r\n \r\n \r\n\r\n";
+
+    #[test]
+    fn test_forbid_response_with_obsolete_line_folding_in_empty_header() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = response.parse(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_EMPTY_HEADER);
+
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_allow_response_with_obsolete_line_folding_in_empty_header() {
+        let mut headers = [EMPTY_HEADER; 1];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_obsolete_multiline_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_EMPTY_HEADER);
+
+        assert_eq!(result, Ok(Status::Complete(RESPONSE_WITH_OBSOLETE_LINE_FOLDING_IN_EMPTY_HEADER.len())));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Line-Folded-Header");
+        assert_eq!(response.headers[0].value, &b""[..]);
+    }
+
+    #[test]
+    fn test_chunk_size() {
+        assert_eq!(parse_chunk_size(b"0\r\n"), Ok(Status::Complete((3, 0))));
+        assert_eq!(parse_chunk_size(b"12\r\nchunk"), Ok(Status::Complete((4, 18))));
+        assert_eq!(parse_chunk_size(b"3086d\r\n"), Ok(Status::Complete((7, 198765))));
+        assert_eq!(parse_chunk_size(b"3735AB1;foo bar*\r\n"), Ok(Status::Complete((18, 57891505))));
+        assert_eq!(parse_chunk_size(b"3735ab1 ; baz \r\n"), Ok(Status::Complete((16, 57891505))));
+        assert_eq!(parse_chunk_size(b"77a65\r"), Ok(Status::Partial));
+        assert_eq!(parse_chunk_size(b"ab"), Ok(Status::Partial));
+        assert_eq!(parse_chunk_size(b"567f8a\rfoo"), Err(crate::InvalidChunkSize));
+        assert_eq!(parse_chunk_size(b"567f8a\rfoo"), Err(crate::InvalidChunkSize));
+        assert_eq!(parse_chunk_size(b"567xf8a\r\n"), Err(crate::InvalidChunkSize));
+        assert_eq!(parse_chunk_size(b"ffffffffffffffff\r\n"), Ok(Status::Complete((18, std::u64::MAX))));
+        assert_eq!(parse_chunk_size(b"1ffffffffffffffff\r\n"), Err(crate::InvalidChunkSize));
+        assert_eq!(parse_chunk_size(b"Affffffffffffffff\r\n"), Err(crate::InvalidChunkSize));
+        assert_eq!(parse_chunk_size(b"fffffffffffffffff\r\n"), Err(crate::InvalidChunkSize));
+    }
+
+    static RESPONSE_WITH_MULTIPLE_SPACE_DELIMITERS: &[u8] =
+        b"HTTP/1.1   200  OK\r\n\r\n";
+
+    #[test]
+    fn test_forbid_response_with_multiple_space_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut response = Response::new(&mut headers[..]);
+        let result = response.parse(RESPONSE_WITH_MULTIPLE_SPACE_DELIMITERS);
+
+        assert_eq!(result, Err(crate::Error::Status));
+    }
+
+    #[test]
+    fn test_allow_response_with_multiple_space_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_multiple_spaces_in_response_status_delimiters(true)
+            .parse_response(&mut response, RESPONSE_WITH_MULTIPLE_SPACE_DELIMITERS);
+
+        assert_eq!(result, Ok(Status::Complete(RESPONSE_WITH_MULTIPLE_SPACE_DELIMITERS.len())));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 0);
+    }
+
+    /// This is technically allowed by the spec, but we only support multiple spaces as an option,
+    /// not stray `\r`s.
+    static RESPONSE_WITH_WEIRD_WHITESPACE_DELIMITERS: &[u8] =
+        b"HTTP/1.1 200\rOK\r\n\r\n";
+
+    #[test]
+    fn test_forbid_response_with_weird_whitespace_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut response = Response::new(&mut headers[..]);
+        let result = response.parse(RESPONSE_WITH_WEIRD_WHITESPACE_DELIMITERS);
+
+        assert_eq!(result, Err(crate::Error::Status));
+    }
+
+    #[test]
+    fn test_still_forbid_response_with_weird_whitespace_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_multiple_spaces_in_response_status_delimiters(true)
+            .parse_response(&mut response, RESPONSE_WITH_WEIRD_WHITESPACE_DELIMITERS);
+        assert_eq!(result, Err(crate::Error::Status));
+    }
+
+    static REQUEST_WITH_MULTIPLE_SPACE_DELIMITERS: &[u8] =
+        b"GET  /    HTTP/1.1\r\n\r\n";
+
+    #[test]
+    fn test_forbid_request_with_multiple_space_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut request = Request::new(&mut headers[..]);
+        let result = request.parse(REQUEST_WITH_MULTIPLE_SPACE_DELIMITERS);
+
+        assert_eq!(result, Err(crate::Error::Token));
+    }
+
+    #[test]
+    fn test_allow_request_with_multiple_space_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut request = Request::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_multiple_spaces_in_request_line_delimiters(true)
+            .parse_request(&mut request, REQUEST_WITH_MULTIPLE_SPACE_DELIMITERS);
+
+        assert_eq!(result, Ok(Status::Complete(REQUEST_WITH_MULTIPLE_SPACE_DELIMITERS.len())));
+        assert_eq!(request.method.unwrap(), "GET");
+        assert_eq!(request.path.unwrap(), "/");
+        assert_eq!(request.version.unwrap(), 1);
+        assert_eq!(request.headers.len(), 0);
+    }
+
+    /// This is technically allowed by the spec, but we only support multiple spaces as an option,
+    /// not stray `\r`s.
+    static REQUEST_WITH_WEIRD_WHITESPACE_DELIMITERS: &[u8] =
+        b"GET\r/\rHTTP/1.1\r\n\r\n";
+
+    #[test]
+    fn test_forbid_request_with_weird_whitespace_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut request = Request::new(&mut headers[..]);
+        let result = request.parse(REQUEST_WITH_WEIRD_WHITESPACE_DELIMITERS);
+
+        assert_eq!(result, Err(crate::Error::Token));
+    }
+
+    #[test]
+    fn test_still_forbid_request_with_weird_whitespace_delimiters() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut request = Request::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_multiple_spaces_in_request_line_delimiters(true)
+            .parse_request(&mut request, REQUEST_WITH_WEIRD_WHITESPACE_DELIMITERS);
+        assert_eq!(result, Err(crate::Error::Token));
+    }
+
+    static REQUEST_WITH_MULTIPLE_SPACES_AND_BAD_PATH: &[u8] = b"GET   /foo>ohno HTTP/1.1\r\n\r\n";
+
+    #[test]
+    fn test_request_with_multiple_spaces_and_bad_path() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut request = Request::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_multiple_spaces_in_request_line_delimiters(true)
+            .parse_request(&mut request, REQUEST_WITH_MULTIPLE_SPACES_AND_BAD_PATH);
+        assert_eq!(result, Err(crate::Error::Token));
+    }
+
+    static RESPONSE_WITH_SPACES_IN_CODE: &[u8] = b"HTTP/1.1 99 200 OK\r\n\r\n";
+
+    #[test]
+    fn test_response_with_spaces_in_code() {
+        let mut headers = [EMPTY_HEADER; NUM_OF_HEADERS];
+        let mut response = Response::new(&mut headers[..]);
+        let result = crate::ParserConfig::default()
+            .allow_multiple_spaces_in_response_status_delimiters(true)
+            .parse_response(&mut response, RESPONSE_WITH_SPACES_IN_CODE);
+        assert_eq!(result, Err(crate::Error::Status));
+    }
+
+    #[test]
+    fn test_response_with_empty_header_name() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\n: hello\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .allow_spaces_after_header_name_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Ok(Status::Complete(45)));
+
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Bread");
+        assert_eq!(response.headers[0].value, &b"baguette"[..]);
+    }
+
+    #[test]
+    fn test_request_with_whitespace_between_header_name_and_colon() {
+        const REQUEST: &[u8] =
+            b"GET / HTTP/1.1\r\nAccess-Control-Allow-Credentials  : true\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut request = Request::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .allow_spaces_after_header_name_in_responses(true)
+            .parse_request(&mut request, REQUEST);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+
+            .ignore_invalid_headers_in_responses(true)
+            .parse_request(&mut request, REQUEST);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_response_with_invalid_char_between_header_name_and_colon() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials\xFF  : true\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .allow_spaces_after_header_name_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+
+        assert_eq!(result, Ok(Status::Complete(79)));
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Bread");
+        assert_eq!(response.headers[0].value, &b"baguette"[..]);
+    }
+
+    #[test]
+    fn test_ignore_header_line_with_missing_colon() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Ok(Status::Complete(70)));
+
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Bread");
+        assert_eq!(response.headers[0].value, &b"baguette"[..]);
+    }
+
+    #[test]
+    fn test_header_with_missing_colon_with_folding() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials   \r\n hello\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .allow_obsolete_multiline_headers_in_responses(true)
+            .allow_spaces_after_header_name_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Ok(Status::Complete(81)));
+
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Bread");
+        assert_eq!(response.headers[0].value, &b"baguette"[..]);
+    }
+
+    #[test]
+    fn test_header_with_nul_in_header_name() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Cred\0entials: hello\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_header_with_cr_in_header_name() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Cred\rentials: hello\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_header_with_nul_in_whitespace_before_colon() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials   \0: hello\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .allow_spaces_after_header_name_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+
+        let result = crate::ParserConfig::default()
+            .allow_spaces_after_header_name_in_responses(true)
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderName));
+    }
+
+    #[test]
+    fn test_header_with_nul_in_value() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials: hell\0o\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderValue));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderValue));
+    }
+
+    #[test]
+    fn test_header_with_invalid_char_in_value() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials: hell\x01o\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderValue));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Ok(Status::Complete(78)));
+
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Bread");
+        assert_eq!(response.headers[0].value, &b"baguette"[..]);
+    }
+
+    #[test]
+    fn test_header_with_invalid_char_in_value_with_folding() {
+        const RESPONSE: &[u8] =
+            b"HTTP/1.1 200 OK\r\nAccess-Control-Allow-Credentials: hell\x01o  \n world!\r\nBread: baguette\r\n\r\n";
+
+        let mut headers = [EMPTY_HEADER; 2];
+        let mut response = Response::new(&mut headers[..]);
+
+        let result = crate::ParserConfig::default()
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Err(crate::Error::HeaderValue));
+
+        let result = crate::ParserConfig::default()
+            .ignore_invalid_headers_in_responses(true)
+            .parse_response(&mut response, RESPONSE);
+        assert_eq!(result, Ok(Status::Complete(88)));
+
+        assert_eq!(response.version.unwrap(), 1);
+        assert_eq!(response.code.unwrap(), 200);
+        assert_eq!(response.reason.unwrap(), "OK");
+        assert_eq!(response.headers.len(), 1);
+        assert_eq!(response.headers[0].name, "Bread");
+        assert_eq!(response.headers[0].value, &b"baguette"[..]);
+    }
+}