NAME
HTTP::Tiny - A small, simple, correct HTTP/1.1 client
VERSION
version 0.058
SYNOPSIS
use HTTP::Tiny;
my $response = HTTP::Tiny->new->get('http://example.com/');
die "Failed!\n" unless $response->{success};
print "$response->{status} $response->{reason}\n";
while (my ($k, $v) = each %{$response->{headers}}) {
for (ref $v eq 'ARRAY' ? @$v : $v) {
print "$k: $_\n";
}
}
print $response->{content} if length $response->{content};
DESCRIPTION
This is a very simple HTTP/1.1 client, designed for doing simple
requests without the overhead of a large framework like LWP::UserAgent.
It is more correct and more complete than HTTP::Lite. It supports
proxies and redirection. It also correctly resumes after EINTR.
If IO::Socket::IP 0.25 or later is installed, HTTP::Tiny will use it
instead of IO::Socket::INET for transparent support for both IPv4 and
IPv6.
Cookie support requires HTTP::CookieJar or an equivalent class.
METHODS
new
$http = HTTP::Tiny->new( %attributes );
This constructor returns a new HTTP::Tiny object. Valid attributes
include:
* "agent" — A user-agent string (defaults to 'HTTP-Tiny/$VERSION'). If
"agent" — ends in a space character, the default user-agent string
is appended.
* "cookie_jar" — An instance of HTTP::CookieJar — or equivalent class
that supports the "add" and "cookie_header" methods
* "default_headers" — A hashref of default headers to apply to
requests
* "local_address" — The local IP address to bind to
* "keep_alive" — Whether to reuse the last connection (if for the same
scheme, host and port) (defaults to 1)
* "max_redirect" — Maximum number of redirects allowed (defaults to 5)
* "max_size" — Maximum response size in bytes (only when not using a
data callback). If defined, responses larger than this will return
an exception.
* "http_proxy" — URL of a proxy server to use for HTTP connections
(default is $ENV{http_proxy} — if set)
* "https_proxy" — URL of a proxy server to use for HTTPS connections
(default is $ENV{https_proxy} — if set)
* "proxy" — URL of a generic proxy server for both HTTP and HTTPS
connections (default is $ENV{all_proxy} — if set)
* "no_proxy" — List of domain suffixes that should not be proxied.
Must be a comma-separated string or an array reference. (default is
$ENV{no_proxy} —)
* "timeout" — Request timeout in seconds (default is 60) If a socket
open, read or write takes longer than the timeout, an exception is
thrown.
* "verify_SSL" — A boolean that indicates whether to validate the SSL
certificate of an "https" — connection (default is false)
* "SSL_options" — A hashref of "SSL_*" — options to pass through to
IO::Socket::SSL
Passing an explicit "undef" for "proxy", "http_proxy" or "https_proxy"
will prevent getting the corresponding proxies from the environment.
Exceptions from "max_size", "timeout" or other errors will result in a
pseudo-HTTP status code of 599 and a reason of "Internal Exception". The
content field in the response will contain the text of the exception.
The "keep_alive" parameter enables a persistent connection, but only to
a single destination scheme, host and port. Also, if any
connection-relevant attributes are modified, or if the process ID or
thread ID change, the persistent connection will be dropped. If you want
persistent connections across multiple destinations, use multiple
HTTP::Tiny objects.
See "SSL SUPPORT" for more on the "verify_SSL" and "SSL_options"
attributes.
get|head|put|post|delete
$response = $http->get($url);
$response = $http->get($url, \%options);
$response = $http->head($url);
These methods are shorthand for calling "request()" for the given
method. The URL must have unsafe characters escaped and international
domain names encoded. See "request()" for valid options and a
description of the response.
The "success" field of the response will be true if the status code is
2XX.
post_form
$response = $http->post_form($url, $form_data);
$response = $http->post_form($url, $form_data, \%options);
This method executes a "POST" request and sends the key/value pairs from
a form data hash or array reference to the given URL with a
"content-type" of "application/x-www-form-urlencoded". If data is
provided as an array reference, the order is preserved; if provided as a
hash reference, the terms are sorted on key and value for consistency.
See documentation for the "www_form_urlencode" method for details on the
encoding.
The URL must have unsafe characters escaped and international domain
names encoded. See "request()" for valid options and a description of
the response. Any "content-type" header or content in the options
hashref will be ignored.
The "success" field of the response will be true if the status code is
2XX.
mirror
$response = $http->mirror($url, $file, \%options)
if ( $response->{success} ) {
print "$file is up to date\n";
}
Executes a "GET" request for the URL and saves the response body to the
file name provided. The URL must have unsafe characters escaped and
international domain names encoded. If the file already exists, the
request will include an "If-Modified-Since" header with the modification
timestamp of the file. You may specify a different "If-Modified-Since"
header yourself in the "$options->{headers}" hash.
The "success" field of the response will be true if the status code is
2XX or if the status code is 304 (unmodified).
If the file was modified and the server response includes a properly
formatted "Last-Modified" header, the file modification time will be
updated accordingly.
request
$response = $http->request($method, $url);
$response = $http->request($method, $url, \%options);
Executes an HTTP request of the given method type ('GET', 'HEAD',
'POST', 'PUT', etc.) on the given URL. The URL must have unsafe
characters escaped and international domain names encoded.
If the URL includes a "user:password" stanza, they will be used for
Basic-style authorization headers. (Authorization headers will not be
included in a redirected request.) For example:
$http->request('GET', 'http://Aladdin:open sesame@example.com/');
If the "user:password" stanza contains reserved characters, they must be
percent-escaped:
$http->request('GET', 'http://john%40example.com:password@example.com/');
A hashref of options may be appended to modify the request.
Valid options are:
* "headers" — A hashref containing headers to include with the
request. If the value for a header is an array reference, the header
will be output multiple times with each value in the array. These
headers over-write any default headers.
* "content" — A scalar to include as the body of the request OR a code
reference that will be called iteratively to produce the body of the
request
* "trailer_callback" — A code reference that will be called if it
exists to provide a hashref of trailing headers (only used with
chunked transfer-encoding)
* "data_callback" — A code reference that will be called for each
chunks of the response body received.
* "peer" — Override host resolution and force all connections to go
only to a specific peer address, regardless of the URL of the
request. This will include any redirections! This options should be
used with extreme caution (e.g. debugging or very special
circumstances).
The "Host" header is generated from the URL in accordance with RFC 2616.
It is a fatal error to specify "Host" in the "headers" option. Other
headers may be ignored or overwritten if necessary for transport
compliance.
If the "content" option is a code reference, it will be called
iteratively to provide the content body of the request. It should return
the empty string or undef when the iterator is exhausted.
If the "content" option is the empty string, no "content-type" or
"content-length" headers will be generated.
If the "data_callback" option is provided, it will be called iteratively
until the entire response body is received. The first argument will be a
string containing a chunk of the response body, the second argument will
be the in-progress response hash reference, as described below. (This
allows customizing the action of the callback based on the "status" or
"headers" received prior to the content body.)
The "request" method returns a hashref containing the response. The
hashref will have the following keys:
* "success" — Boolean indicating whether the operation returned a 2XX
status code
* "url" — URL that provided the response. This is the URL of the
request unless there were redirections, in which case it is the last
URL queried in a redirection chain
* "status" — The HTTP status code of the response
* "reason" — The response phrase returned by the server
* "content" — The body of the response. If the response does not have
any content or if a data callback is provided to consume the
response body, this will be the empty string
* "headers" — A hashref of header fields. All header field names will
be normalized to be lower case. If a header is repeated, the value
will be an arrayref; it will otherwise be a scalar string containing
the value
* "redirects" If this field exists, it is an arrayref of response hash
references from redirects in the same order that redirections
occurred. If it does not exist, then no redirections occurred.
On an exception during the execution of the request, the "status" field
will contain 599, and the "content" field will contain the text of the
exception.
www_form_urlencode
$params = $http->www_form_urlencode( $data );
$response = $http->get("http://example.com/query?$params");
This method converts the key/value pairs from a data hash or array
reference into a "x-www-form-urlencoded" string. The keys and values
from the data reference will be UTF-8 encoded and escaped per RFC 3986.
If a value is an array reference, the key will be repeated with each of
the values of the array reference. If data is provided as a hash
reference, the key/value pairs in the resulting string will be sorted by
key and value for consistent ordering.
can_ssl
$ok = HTTP::Tiny->can_ssl;
($ok, $why) = HTTP::Tiny->can_ssl;
($ok, $why) = $http->can_ssl;
Indicates if SSL support is available. When called as a class object, it
checks for the correct version of Net::SSLeay and IO::Socket::SSL. When
called as an object methods, if "SSL_verify" is true or if
"SSL_verify_mode" is set in "SSL_options", it checks that a CA file is
available.
In scalar context, returns a boolean indicating if SSL is available. In
list context, returns the boolean and a (possibly multi-line) string of
errors indicating why SSL isn't available.
connected
$host = $http->connected;
($host, $port) = $http->connected;
Indicates if a connection to a peer is being kept alive, per the
"keep_alive" option.
In scalar context, returns the peer host and port, joined with a colon,
or "undef" (if no peer is connected). In list context, returns the peer
host and port or an empty list (if no peer is connected).
Note: This method cannot reliably be used to discover whether the remote
host has closed its end of the socket.
SSL SUPPORT
Direct "https" connections are supported only if IO::Socket::SSL 1.56 or
greater and Net::SSLeay 1.49 or greater are installed. An exception will
be thrown if new enough versions of these modules are not installed or
if the SSL encryption fails. You can also use "HTTP::Tiny::can_ssl()"
utility function that returns boolean to see if the required modules are
installed.
An "https" connection may be made via an "http" proxy that supports the
CONNECT command (i.e. RFC 2817). You may not proxy "https" via a proxy
that itself requires "https" to communicate.
SSL provides two distinct capabilities:
* Encrypted communication channel
* Verification of server identity
By default, HTTP::Tiny does not verify server identity.
Server identity verification is controversial and potentially tricky
because it depends on a (usually paid) third-party Certificate Authority
(CA) trust model to validate a certificate as legitimate. This
discriminates against servers with self-signed certificates or
certificates signed by free, community-driven CA's such as CAcert.org
<http://cacert.org>.
By default, HTTP::Tiny does not make any assumptions about your trust
model, threat level or risk tolerance. It just aims to give you an
encrypted channel when you need one.
Setting the "verify_SSL" attribute to a true value will make HTTP::Tiny
verify that an SSL connection has a valid SSL certificate corresponding
to the host name of the connection and that the SSL certificate has been
verified by a CA. Assuming you trust the CA, this will protect against a
man-in-the-middle attack
<http://en.wikipedia.org/wiki/Man-in-the-middle_attack>. If you are
concerned about security, you should enable this option.
Certificate verification requires a file containing trusted CA
certificates.
If the environment variable "SSL_CERT_FILE" is present, HTTP::Tiny will
try to find a CA certificate file in that location.
If the Mozilla::CA module is installed, HTTP::Tiny will use the CA file
included with it as a source of trusted CA's. (This means you trust
Mozilla, the author of Mozilla::CA, the CPAN mirror where you got
Mozilla::CA, the toolchain used to install it, and your operating system
security, right?)
If that module is not available, then HTTP::Tiny will search several
system-specific default locations for a CA certificate file:
* /etc/ssl/certs/ca-certificates.crt
* /etc/pki/tls/certs/ca-bundle.crt
* /etc/ssl/ca-bundle.pem
An exception will be raised if "verify_SSL" is true and no CA
certificate file is available.
If you desire complete control over SSL connections, the "SSL_options"
attribute lets you provide a hash reference that will be passed through
to "IO::Socket::SSL::start_SSL()", overriding any options set by
HTTP::Tiny. For example, to provide your own trusted CA file:
SSL_options => {
SSL_ca_file => $file_path,
}
The "SSL_options" attribute could also be used for such things as
providing a client certificate for authentication to a server or
controlling the choice of cipher used for the SSL connection. See
IO::Socket::SSL documentation for details.
PROXY SUPPORT
HTTP::Tiny can proxy both "http" and "https" requests. Only Basic proxy
authorization is supported and it must be provided as part of the proxy
URL: "http://user:pass@proxy.example.com/".
HTTP::Tiny supports the following proxy environment variables:
* http_proxy or HTTP_PROXY
* https_proxy or HTTPS_PROXY
* all_proxy or ALL_PROXY
If the "REQUEST_METHOD" environment variable is set, then this might be
a CGI process and "HTTP_PROXY" would be set from the "Proxy:" header,
which is a security risk. If "REQUEST_METHOD" is set, "HTTP_PROXY" (the
upper case variant only) is ignored.
Tunnelling "https" over an "http" proxy using the CONNECT method is
supported. If your proxy uses "https" itself, you can not tunnel "https"
over it.
Be warned that proxying an "https" connection opens you to the risk of a
man-in-the-middle attack by the proxy server.
The "no_proxy" environment variable is supported in the format of a
comma-separated list of domain extensions proxy should not be used for.
Proxy arguments passed to "new" will override their corresponding
environment variables.
LIMITATIONS
HTTP::Tiny is *conditionally compliant* with the HTTP/1.1 specifications
<http://www.w3.org/Protocols/>:
* "Message Syntax and Routing" [RFC7230]
* "Semantics and Content" [RFC7231]
* "Conditional Requests" [RFC7232]
* "Range Requests" [RFC7233]
* "Caching" [RFC7234]
* "Authentication" [RFC7235]
It attempts to meet all "MUST" requirements of the specification, but
does not implement all "SHOULD" requirements. (Note: it was developed
against the earlier RFC 2616 specification and may not yet meet the
revised RFC 7230-7235 spec.)
Some particular limitations of note include:
* HTTP::Tiny focuses on correct transport. Users are responsible for
ensuring that user-defined headers and content are compliant with
the HTTP/1.1 specification.
* Users must ensure that URLs are properly escaped for unsafe
characters and that international domain names are properly encoded
to ASCII. See URI::Escape, URI::_punycode and Net::IDN::Encode.
* Redirection is very strict against the specification. Redirection is
only automatic for response codes 301, 302, 307 and 308 if the
request method is 'GET' or 'HEAD'. Response code 303 is always
converted into a 'GET' redirection, as mandated by the
specification. There is no automatic support for status 305 ("Use
proxy") redirections.
* There is no provision for delaying a request body using an "Expect"
header. Unexpected "1XX" responses are silently ignored as per the
specification.
* Only 'chunked' "Transfer-Encoding" is supported.
* There is no support for a Request-URI of '*' for the 'OPTIONS'
request.
* Headers mentioned in the RFCs and some other, well-known headers are
generated with their canonical case. Other headers are sent in the
case provided by the user. Except for control headers (which are
sent first), headers are sent in arbitrary order.
Despite the limitations listed above, HTTP::Tiny is considered
feature-complete. New feature requests should be directed to
HTTP::Tiny::UA.
SEE ALSO
* HTTP::Tiny::UA - Higher level UA features for HTTP::Tiny
* HTTP::Thin - HTTP::Tiny wrapper with HTTP::Request/HTTP::Response
compatibility
* HTTP::Tiny::Mech - Wrap WWW::Mechanize instance in HTTP::Tiny
compatible interface
* IO::Socket::IP - Required for IPv6 support
* IO::Socket::SSL - Required for SSL support
* LWP::UserAgent - If HTTP::Tiny isn't enough for you, this is the
"standard" way to do things
* Mozilla::CA - Required if you want to validate SSL certificates
* Net::SSLeay - Required for SSL support
SUPPORT
Bugs / Feature Requests
Please report any bugs or feature requests through the issue tracker at
<https://github.com/chansen/p5-http-tiny/issues>. You will be notified
automatically of any progress on your issue.
Source Code
This is open source software. The code repository is available for
public review and contribution under the terms of the license.
<https://github.com/chansen/p5-http-tiny>
git clone https://github.com/chansen/p5-http-tiny.git
AUTHORS
* Christian Hansen <chansen@cpan.org>
* David Golden <dagolden@cpan.org>
CONTRIBUTORS
* Alan Gardner <gardner@pythian.com>
* Alessandro Ghedini <al3xbio@gmail.com>
* A. Sinan Unur <nanis@cpan.org>
* Brad Gilbert <bgills@cpan.org>
* brian m. carlson <sandals@crustytoothpaste.net>
* Chris Nehren <apeiron@cpan.org>
* Chris Weyl <cweyl@alumni.drew.edu>
* Claes Jakobsson <claes@surfar.nu>
* Clinton Gormley <clint@traveljury.com>
* David Golden <xdg@xdg.me>
* Dean Pearce <pearce@pythian.com>
* Edward Zborowski <ed@rubensteintech.com>
* James Raspass <jraspass@gmail.com>
* Jeremy Mates <jmates@cpan.org>
* Jess Robinson <castaway@desert-island.me.uk>
* Lukas Eklund <leklund@gmail.com>
* Martin J. Evans <mjegh@ntlworld.com>
* Martin-Louis Bright <mlbright@gmail.com>
* Mike Doherty <doherty@cpan.org>
* Olaf Alders <olaf@wundersolutions.com>
* Olivier Mengué <dolmen@cpan.org>
* Petr Písař <ppisar@redhat.com>
* SkyMarshal <skymarshal1729@gmail.com>
* Sören Kornetzki <soeren.kornetzki@delti.com>
* Syohei YOSHIDA <syohex@gmail.com>
* Tatsuhiko Miyagawa <miyagawa@bulknews.net>
* Tom Hukins <tom@eborcom.com>
* Tony Cook <tony@develop-help.com>
COPYRIGHT AND LICENSE
This software is copyright (c) 2016 by Christian Hansen.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.