How to Check HTTP Version
At work I recently had a query where Python Simple HTTP Server was not working for a particular application. On the Python console "HTTP 200" responses were seeing (HTTP code for 'OK'), but the connection failed. I also tested it with 'updog - again we saw HTTP 200 responses but the connection ultimately failed.
After some investigation, it was determined that the client device required HTTP/1.1 and it was found that Python Simple HTTP Server, by default, servers HTTP/1.0. From here I wanted to understand how to determine what HTTP version is being served. It turns out that this is quite easy to do (when you know how).
From the command line we can do
curl --head http://server[:port]
"[:port]" is only required if the server is not serving on the default HTTP port 80
For the Python HTTP Server, should get a result which looks like:
HTTP/1.0 200 OK Server: SimpleHTTP/0.6 Python/3.7.3 Date: Wed, 16 Mar 2022 13:24:08 GMT Content-type: text/html; charset=utf-8 Content-Length:1068
For an Apache server, you should see something like this:
HTTP/1.1 200 OK Date: Web, 16 Mar 2022 13:29:49 GMT Server: Apache/2.4.52 (Unit) Last-Modified: Mon, 11 Jun 2007 18:53:14 GMT ETag: "2d-432a5e4a73a80" Accept-Ranges: bytes Content-Length: 45 Content-Type: text/html
You will see from these two outputs that the first line shows which HTTP version is being served.
As mentioned, the Python HTTP Server will serve HTTP/1.0 by default. This can be modified, however my Python knowledge is not deep enough to understand how to modify this as yet (if I get it working, then I will make a new post). If you want to have a go at working it out yourself, then yYou can read up on the Python HTTP Server here. If you wish to run a Python HTTP Server, then you can achieve this by doing:
python -m http.server [port]
If no port number is specified, it will default to port 8000
This is great for testing how pages etc render, however it is not recommended to use this in a production environment.