Documentation

A new client connected to the server. We haven't accepted the connection yet, though.

Accept a pending connection, turning it into a Connection.

This datatype allows you to set options for acceptRequestWith. It is strongly recommended to use defaultAcceptRequest and then modify the various fields, that way new fields introduced in the library do not break your code.

This function is like acceptRequest but allows you to set custom options using the AcceptRequest datatype.

Requires calling pendingStream and close.

Parameters that allow you to tweak how a request is rejected. Please use defaultRejectRequest and modify fields using record syntax so your code will not break when new fields are added.

Set options for a Connection. Please do not use this constructor directly, but rather use defaultConnectionOptions and then set the fields you want, e.g.:

myOptions = defaultConnectionOptions {connectionStrictUnicode = True}

This way your code does not break if the library introduces new fields.

The default connection options:

• Nothing happens when a pong is received.
• Compression is disabled.
• Lenient unicode decoding.
• 30 second timeout for connection establishment.

Receive an application message. Automatically respond to control messages.

When the peer sends a close control message, an exception of type CloseRequest is thrown. The peer can send a close control message either to initiate a close or in response to a close message we have sent to the peer. In either case the CloseRequest exception will be thrown. The RFC specifies that the server is responsible for closing the TCP connection, which should happen after receiving the CloseRequest exception from this function.

This will throw ConnectionClosed if the TCP connection dies unexpectedly.

Receive a message, converting it to whatever format is needed.

Send a Message. This allows you send both human-readable text and binary data. This is a slightly more low-level interface than sendTextData or sendBinaryData.

Send a collection of Messages. This is more efficient than calling sendDataMessage many times.

Send a textual message. The message will be encoded as UTF-8. This should be the default choice for human-readable text-based protocols such as JSON.

Send a number of textual messages. This is more efficient than calling sendTextData many times.

Send a binary message. This is useful for sending binary blobs, e.g. images, data encoded with MessagePack, images...

Send a number of binary messages. This is more efficient than calling sendBinaryData many times.

Send a friendly close message. Note that after sending this message, you should still continue calling receiveDataMessage to process any in-flight messages. The peer will eventually respond with a close control message of its own which will cause receiveDataMessage to throw the CloseRequest exception. This exception is when you can finally consider the connection closed.

Send a friendly close message and close code. Similar to sendClose, you should continue calling receiveDataMessage until you receive a CloseRequest exception.

See http://tools.ietf.org/html/rfc6455#section-7.4 for a list of close codes.

Send a ping

Send a pong

Forks a ping thread, sending a ping message every n seconds over the connection. The thread is killed when the inner IO action is finished.

This is useful to keep idle connections open through proxies and whatnot. Many (but not all) proxies have a 60 second default timeout, so based on that sending a ping every 30 seconds is a good idea.

Note that usually you want to use withPingPong to timeout the connection if a pong is not received.

DEPRECATED: Use withPingThread instead.

Forks a ping thread, sending a ping message every n seconds over the connection. The thread dies silently if the connection crashes or is closed.

This is useful to keep idle connections open through proxies and whatnot. Many (but not all) proxies have a 60 second default timeout, so based on that sending a ping every 30 seconds is a good idea.

Use this if you want to run the ping thread yourself.

See also withPingThread.

Four extension parameters are defined for "permessage-deflate" to help endpoints manage per-connection resource usage.

• "server_no_context_takeover"
• "client_no_context_takeover"
• "server_max_window_bits"
• "client_max_window_bits"

A size limit, in bytes. The Monoid instance takes the minimum limit.