Mojo::UserAgent(3)

NAME
Mojo::UserAgent - Non-blocking I/O HTTP and WebSocket user agent

SYNOPSIS
  use Mojo::UserAgent;

  # Say hello to the Unicode snowman and include an Accept header
  my $ua = Mojo::UserAgent->new;
  say $ua->get('www.☃.net?hello=there' => {Accept => '*/*'})->res->body;

  # Form POST (application/x-www-form-urlencoded) with exception handling
  my $tx = $ua->post('https://metacpan.org/search' => form => {q => 'mojo'});
  if (my $res = $tx->success) { say $res->body }
  else {
    my $err = $tx->error;
    die "$err->{code} response: $err->{message}" if $err->{code};
    die "Connection error: $err->{message}";
  }

  # Extract data from HTML and XML resources with CSS selectors
  say $ua->get('www.perl.org')->res->dom->at('title')->text;

  # Scrape the latest headlines from a news site
  say $ua->get('blogs.perl.org')
    ->res->dom->find('h2 > a')->map('text')->join("\n");

  # IPv6 PUT request with Content-Type header and content
  my $tx = $ua->put('[::1]:3000' => {'Content-Type' => 'text/plain'} => 'Hi!');

  # Quick JSON API request with Basic authentication
  my $value = $ua->get('https://sri:s3cret@example.com/test.json')->res->json;

  # JSON POST (application/json) with TLS certificate authentication
  my $tx = $ua->cert('tls.crt')->key('tls.key')
    ->post('https://example.com' => json => {top => 'secret'});

  # Search DuckDuckGo anonymously through Tor
  $ua->proxy->http('socks://127.0.0.1:9050');
  say $ua->get('api.3g2upl4pq6kufc4m.onion/?q=mojolicious&format=json')
    ->res->json('/Abstract');

  # Follow redirects to download Mojolicious from GitHub
  $ua->max_redirects(5)
    ->get('https://www.github.com/kraih/mojo/tarball/master')
    ->res->content->asset->move_to('/home/sri/mojo.tar.gz');

  # Non-blocking concurrent requests
  Mojo::IOLoop->delay(
    sub {
      my $delay = shift;
      $ua->get('mojolicio.us' => $delay->begin);
      $ua->get('cpan.org'     => $delay->begin);
    },
    sub {
      my ($delay, $mojo, $cpan) = @_;
      say $mojo->res->dom->at('title')->text;
      say $cpan->res->dom->at('title')->text;
    }
  )->wait;

  # Non-blocking WebSocket connection sending and receiving JSON messages
  $ua->websocket('ws://example.com/echo.json' => sub {
    my ($ua, $tx) = @_;
    say 'WebSocket handshake failed!' and return unless $tx->is_websocket;
    $tx->on(json => sub {
      my ($tx, $hash) = @_;
      say "WebSocket message via JSON: $hash->{msg}";
      $tx->finish;
    });
    $tx->send({json => {msg => 'Hello World!'}});
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

DESCRIPTION
Mojo::UserAgent is a full featured non-blocking I/O HTTP and WebSocket user agent, with IPv6, TLS, SNI, IDNA, HTTP/SOCKS5 proxy, Comet (long polling), keep-alive, connection pooling, timeout, cookie, multipart, gzip compression and multiple event loop support.

All connections will be reset automatically if a new process has been forked, this allows multiple processes to share the same Mojo::UserAgent object safely.

For better scalability (epoll, kqueue) and to provide non-blocking name resolution, SOCKS5 as well as TLS support, the optional modules EV (4.0+), Net::DNS::Native (0.15+), IO::Socket::Socks (0.64+) and IO::Socket::SSL (1.94+) will be used automatically if possible. Individual features can also be disabled with the "MOJO_NO_NDN", "MOJO_NO_SOCKS" and "MOJO_NO_TLS" environment variables.

See "USER AGENT" in Mojolicious::Guides::Cookbook for more.

EVENTS
Mojo::UserAgent inherits all events from Mojo::EventEmitter and can emit the following new ones.

  start
  $ua->on(start => sub {
    my ($ua, $tx) = @_;
    ...
  });

Emitted whenever a new transaction is about to start, this includes automatically prepared proxy "CONNECT" requests and followed redirects.

  $ua->on(start => sub {
    my ($ua, $tx) = @_;
    $tx->req->headers->header('X-Bender' => 'Bite my shiny metal ass!');
  });

ATTRIBUTES
Mojo::UserAgent implements the following attributes.

  ca
  my $ca = $ua->ca;
  $ua    = $ua->ca('/etc/tls/ca.crt');

Path to TLS certificate authority file used to verify the peer certificate, defaults to the value of the "MOJO_CA_FILE" environment variable. Also activates hostname verification.

  # Show certificate authorities for debugging
  IO::Socket::SSL::set_defaults(
    SSL_verify_callback => sub { say "Authority: $_[2]" and return $_[0] });

  cert
  my $cert = $ua->cert;
  $ua      = $ua->cert('/etc/tls/client.crt');

Path to TLS certificate file, defaults to the value of the "MOJO_CERT_FILE" environment variable.

  connect_timeout
  my $timeout = $ua->connect_timeout;
  $ua         = $ua->connect_timeout(5);

Maximum amount of time in seconds establishing a connection may take before getting canceled, defaults to the value of the "MOJO_CONNECT_TIMEOUT" environment variable or 10.

  cookie_jar
  my $cookie_jar = $ua->cookie_jar;
  $ua            = $ua->cookie_jar(Mojo::UserAgent::CookieJar->new);

Cookie jar to use for requests performed by this user agent, defaults to a Mojo::UserAgent::CookieJar object.

  # Ignore all cookies
  $ua->cookie_jar->ignore(sub { 1 });

  # Ignore cookies for public suffixes
  my $ps = IO::Socket::SSL::PublicSuffix->default;
  $ua->cookie_jar->ignore(sub {
    my $cookie = shift;
    return undef unless my $domain = $cookie->domain;
    return ($ps->public_suffix($domain))[0] eq '';
  });

  # Add custom cookie to the jar
  $ua->cookie_jar->add(
    Mojo::Cookie::Response->new(
      name   => 'foo',
      value  => 'bar',
      domain => 'mojolicio.us',
      path   => '/perldoc'
    )
  );

  inactivity_timeout
  my $timeout = $ua->inactivity_timeout;
  $ua         = $ua->inactivity_timeout(15);

Maximum amount of time in seconds a connection can be inactive before getting closed, defaults to the value of the "MOJO_INACTIVITY_TIMEOUT" environment variable or 20. Setting the value to 0 will allow connections to be inactive indefinitely.

  ioloop
  my $loop = $ua->ioloop;
  $ua      = $ua->ioloop(Mojo::IOLoop->new);

Event loop object to use for blocking I/O operations, defaults to a Mojo::IOLoop object.

  key
  my $key = $ua->key;
  $ua     = $ua->key('/etc/tls/client.crt');

Path to TLS key file, defaults to the value of the "MOJO_KEY_FILE" environment variable.

  local_address
  my $address = $ua->local_address;
  $ua         = $ua->local_address('127.0.0.1');

Local address to bind to.

  max_connections
  my $max = $ua->max_connections;
  $ua     = $ua->max_connections(5);

Maximum number of keep-alive connections that the user agent will retain before it starts closing the oldest ones, defaults to 5. Setting the value to 0 will prevent any connections from being kept alive.

  max_redirects
  my $max = $ua->max_redirects;
  $ua     = $ua->max_redirects(3);

Maximum number of redirects the user agent will follow before it fails, defaults to the value of the "MOJO_MAX_REDIRECTS" environment variable or 0.

  proxy
  my $proxy = $ua->proxy;
  $ua       = $ua->proxy(Mojo::UserAgent::Proxy->new);

Proxy manager, defaults to a Mojo::UserAgent::Proxy object.

  # Detect proxy servers from environment
  $ua->proxy->detect;

  # Manually configure HTTP proxy (using CONNECT for HTTPS)
  $ua->proxy->http('http://127.0.0.1:8080')->https('http://127.0.0.1:8080');

  # Manually configure Tor (SOCKS5)
  $ua->proxy->http('socks://127.0.0.1:9050')->https('socks://127.0.0.1:9050');

  request_timeout
  my $timeout = $ua->request_timeout;
  $ua         = $ua->request_timeout(5);

Maximum amount of time in seconds establishing a connection, sending the request and receiving a whole response may take before getting canceled, defaults to the value of the "MOJO_REQUEST_TIMEOUT" environment variable or 0. Setting the value to 0 will allow the user agent to wait indefinitely. The timeout will reset for every followed redirect.

  # Total limit of 5 seconds, of which 3 seconds may be spent connecting
  $ua->max_redirects(0)->connect_timeout(3)->request_timeout(5);

  server
  my $server = $ua->server;
  $ua        = $ua->server(Mojo::UserAgent::Server->new);

Application server relative URLs will be processed with, defaults to a Mojo::UserAgent::Server object.

  # Introspect
  say for @{$ua->server->app->secrets};

  # Change log level
  $ua->server->app->log->level('fatal');

  # Port currently used for processing relative URLs blocking
  say $ua->server->url->port;

  # Port currently used for processing relative URLs non-blocking
  say $ua->server->nb_url->port;

  transactor
  my $t = $ua->transactor;
  $ua   = $ua->transactor(Mojo::UserAgent::Transactor->new);

Transaction builder, defaults to a Mojo::UserAgent::Transactor object.

  # Change name of user agent
  $ua->transactor->name('MyUA 1.0');

METHODS
Mojo::UserAgent inherits all methods from Mojo::EventEmitter and implements the following new ones.

  build_tx
  my $tx = $ua->build_tx(GET => 'example.com');
  my $tx = $ua->build_tx(
    PUT => 'http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->build_tx(
    PUT => 'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->build_tx(
    PUT => 'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Generate Mojo::Transaction::HTTP object with "tx" in Mojo::UserAgent::Transactor.

  # Request with custom cookie
  my $tx = $ua->build_tx(GET => 'https://example.com/account');
  $tx->req->cookies({name => 'user', value => 'sri'});
  $tx = $ua->start($tx);

  # Deactivate gzip compression
  my $tx = $ua->build_tx(GET => 'example.com');
  $tx->req->headers->remove('Accept-Encoding');
  $tx = $ua->start($tx);

  # Interrupt response by raising an error
  my $tx = $ua->build_tx(GET => 'http://example.com');
  $tx->res->on(progress => sub {
    my $res = shift;
    return unless my $server = $res->headers->server;
    $res->error({message => 'Oh noes, it is IIS!'}) if $server =~ /IIS/;
  });
  $tx = $ua->start($tx);

  build_websocket_tx
  my $tx = $ua->build_websocket_tx('ws://example.com');
  my $tx = $ua->build_websocket_tx(
    'ws://example.com' => {DNT => 1} => ['v1.proto']);

Generate Mojo::Transaction::HTTP object with "websocket" in Mojo::UserAgent::Transactor.

  # Custom WebSocket handshake with cookie
  my $tx = $ua->build_websocket_tx('wss://example.com/echo');
  $tx->req->cookies({name => 'user', value => 'sri'});
  $ua->start($tx => sub {
    my ($ua, $tx) = @_;
    say 'WebSocket handshake failed!' and return unless $tx->is_websocket;
    $tx->on(message => sub {
      my ($tx, $msg) = @_;
      say "WebSocket message: $msg";
      $tx->finish;
    });
    $tx->send('Hi!');
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  delete
  my $tx = $ua->delete('example.com');
  my $tx = $ua->delete('http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->delete(
    'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->delete(
    'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Perform blocking "DELETE" request and return resulting Mojo::Transaction::HTTP object, takes the same arguments as "tx" in Mojo::UserAgent::Transactor (except for the "DELETE" method, which is implied). You can also append a callback to perform requests non-blocking.

  $ua->delete('http://example.com' => json => {a => 'b'} => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  get
  my $tx = $ua->get('example.com');
  my $tx = $ua->get('http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->get(
    'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->get(
    'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Perform blocking "GET" request and return resulting Mojo::Transaction::HTTP object, takes the same arguments as "tx" in Mojo::UserAgent::Transactor (except for the "GET" method, which is implied). You can also append a callback to perform requests non-blocking.

  $ua->get('http://example.com' => json => {a => 'b'} => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  head
  my $tx = $ua->head('example.com');
  my $tx = $ua->head('http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->head(
    'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->head(
    'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Perform blocking "HEAD" request and return resulting Mojo::Transaction::HTTP object, takes the same arguments as "tx" in Mojo::UserAgent::Transactor (except for the "HEAD" method, which is implied). You can also append a callback to perform requests non-blocking.

  $ua->head('http://example.com' => json => {a => 'b'} => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  options
  my $tx = $ua->options('example.com');
  my $tx = $ua->options('http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->options(
    'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->options(
    'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Perform blocking "OPTIONS" request and return resulting Mojo::Transaction::HTTP object, takes the same arguments as "tx" in Mojo::UserAgent::Transactor (except for the "OPTIONS" method, which is implied). You can also append a callback to perform requests non-blocking.

  $ua->options('http://example.com' => json => {a => 'b'} => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  patch
  my $tx = $ua->patch('example.com');
  my $tx = $ua->patch('http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->patch(
    'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->patch(
    'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Perform blocking "PATCH" request and return resulting Mojo::Transaction::HTTP object, takes the same arguments as "tx" in Mojo::UserAgent::Transactor (except for the "PATCH" method, which is implied). You can also append a callback to perform requests non-blocking.

  $ua->patch('http://example.com' => json => {a => 'b'} => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  post
  my $tx = $ua->post('example.com');
  my $tx = $ua->post('http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->post(
    'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->post(
    'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Perform blocking "POST" request and return resulting Mojo::Transaction::HTTP object, takes the same arguments as "tx" in Mojo::UserAgent::Transactor (except for the "POST" method, which is implied). You can also append a callback to perform requests non-blocking.

  $ua->post('http://example.com' => json => {a => 'b'} => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  put
  my $tx = $ua->put('example.com');
  my $tx = $ua->put('http://example.com' => {Accept => '*/*'} => 'Hi!');
  my $tx = $ua->put(
    'http://example.com' => {Accept => '*/*'} => form => {a => 'b'});
  my $tx = $ua->put(
    'http://example.com' => {Accept => '*/*'} => json => {a => 'b'});

Perform blocking "PUT" request and return resulting Mojo::Transaction::HTTP object, takes the same arguments as "tx" in Mojo::UserAgent::Transactor (except for the "PUT" method, which is implied). You can also append a callback to perform requests non-blocking.

  $ua->put('http://example.com' => json => {a => 'b'} => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  start
  my $tx = $ua->start(Mojo::Transaction::HTTP->new);

Perform blocking request for a custom Mojo::Transaction::HTTP object, which can be prepared manually or with "build_tx". You can also append a callback to perform requests non-blocking.

  my $tx = $ua->build_tx(GET => 'http://example.com');
  $ua->start($tx => sub {
    my ($ua, $tx) = @_;
    say $tx->res->body;
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

  websocket
  $ua->websocket('ws://example.com' => sub {...});
  $ua->websocket(
    'ws://example.com' => {DNT => 1} => ['v1.proto'] => sub {...});

Open a non-blocking WebSocket connection with transparent handshake, takes the same arguments as "websocket" in Mojo::UserAgent::Transactor. The callback will receive either a Mojo::Transaction::WebSocket or Mojo::Transaction::HTTP object, depending on if the handshake was successful.

  $ua->websocket('wss://example.com/echo' => ['v1.proto'] => sub {
    my ($ua, $tx) = @_;
    say 'WebSocket handshake failed!' and return unless $tx->is_websocket;
    $tx->on(finish => sub {
      my ($tx, $code, $reason) = @_;
      say "WebSocket closed with status $code.";
    });
    $tx->on(message => sub {
      my ($tx, $msg) = @_;
      say "WebSocket message: $msg";
      $tx->finish;
    });
    $tx->send('Hi!');
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

You can activate "permessage-deflate" compression by setting the "Sec-WebSocket-Extensions" header, this can result in much better performance, but also increases memory usage by up to 300KB per connection.

  my $headers = {'Sec-WebSocket-Extensions' => 'permessage-deflate'};
  $ua->websocket('ws://example.com/foo' => $headers => sub {...});

DEBUGGING
You can set the "MOJO_USERAGENT_DEBUG" environment variable to get some advanced diagnostics information printed to "STDERR".

  MOJO_USERAGENT_DEBUG=1

SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.