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Data_received

As explained in Python Concurrency with asyncio

data_received is an asyncio protocol callback invoked when bytes arrive from the transport.

data_received is an asyncio.Protocol callback that a transport invokes whenever bytes arrive. Because one response may produce multiple calls, implementations accumulate the bytes in an internal buffer. section 8.2

Use data_received as part of a larger transport-and-protocol lifecycle:

  • Receive bytes from the transport each time the connection delivers data. section 8.2
  • Append successive calls to an internal response buffer rather than assuming one complete response. section 8.2
  • Wait for eof_received to determine that no further data_received calls will occur. section 8.2

Receiving an HTTP response

An asyncio.Protocol sends an HTTP GET request through connection_made. data_received collects the returned bytes, and eof_received marks the response complete so a Future can deliver it to get_response. section 8.2

How Python Concurrency with asyncio covers it

How deep it goes
Explains repeated callbacks, byte buffering, and completion through eof_received, without detailing parsing internals.
Examples
Demonstrates a single HTTP GET whose response arrives across data_received calls and completes when the connection closes.
What you can do after
Build a protocol that buffers incoming bytes and exposes the completed response through an awaitable Future.
How it connects
Connects asyncio.Protocol, Transport, connection_made, eof_received, Future, and HTTP response handling.
Cover of Python Concurrency with asyncio
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