Does Postman support HTTP/2 requests?

Question

I am trying to send an HTTP/2 request using Postman. However, when my server receives the request, it gives an error:

handle: <Handle _SelectorSocketTransport._read_ready()>
Traceback (most recent call last):
  File "/usr/lib64/python3.6/asyncio/events.py", line 145, in _run
    self._callback(*self._args)
  File "/usr/lib64/python3.6/asyncio/selector_events.py", line 721, in _read_ready
    self._protocol.data_received(data)
  File "/home/deesharm/jetconf/jetconf/jetconf/rest_server.py", line 76, in data_received
    events = self.conn.receive_data(data)
  File "/home/deesharm/jetconf/venv/lib/python3.6/site-packages/h2/connection.py", line 1448, in receive_data
    .. versionchanged:: 2.0.0
  File "/home/deesharm/jetconf/venv/lib/python3.6/site-packages/h2/frame_buffer.py", line 52, in add_data
    raise ProtocolError("Invalid HTTP/2 preamble.")
h2.exceptions.ProtocolError: Invalid HTTP/2 preamble.

Does Postman support HTTP/2?

Vigilance

Answer 1

Currently, Postman doesn't support HTTP/2.

https://github.com/postmanlabs/postman-app-support/issues/2701

Gertrudgertruda

Answer 2

As of late 2022, Postman still does not support HTTP2.

A workaround is to click the "Code" icon (looks like </> ) to generate the cURL command, add the --http2 command line flag, then copy/paste it into the terminal:

Works well with any mac / linux terminal as well as WSL2 on Windows. You can also provide the --verbose flag to cURL to make sure HTTP2 is working as expected.

Penzance

I had to include the --http2-prior-knowledge option for cURL to send an HTTP 2 request. – Diapositive

It is --http2-prior-knowledge option – Rufena

Answer 3

I created a GUI tool that you can use to send HTTP requests, with support for HTTP/2 and HTTP/3. It has full compatibility with existing Postman collections and environments.

https://github.com/alexandrehtrb/Pororoca

Hexaemeron

Answer 4

Yes, Postman supports HTTP/2 requests as of version 11.8:

You can now send requests using HTTP/2 - #2701

Open a request, go to Settings and set the HTTP version to HTTP/2. You’re all set!

Pro tip: In App Settings, set the HTTP version to Auto, and you no longer have to worry about setting it for each request.

Note these limitations for 11.8, as mentioned in the linked GitHub issue (future versions may not have these limitations):

However, at the moment, HTTP/2 support is not available when:

• Sending insecure HTTP requests
• Sending requests using proxies

You can read more about it on how to use HTTP/2 on our Learning Center doc.

Jamikajamil