Example for Python HTTP Post Arrow client and server

[arunppsg]

Addresses apache/arrow#40595

In this pull request, I have added an example of HTTP Post Arrow client and server.

The server uses fastapi for and the client uses requests library. Except these, the rest of the code structure is similar to the get_simple example.

If there are any suggestions, feel free to let me know and I will be happy to update the PR accordingly.

[ianmcook]

Thank you @arunppsg! I will review this soon.

[ianmcook]

@arunppsg For the HTTP POST example, we are looking for something different than this.

As described in the README in the http/post_simple directory:

This directory contains minimal examples of HTTP clients and servers demonstrating how a client can send a POST request to a server with a request body consisting of an Arrow IPC stream of record batches.

So in these HTTP POST examples, the client should send the data to the server.

However, I think this FastAPI + Uvicorn example would be a great addition to the HTTP GET examples. May I make some changes to this PR to turn it into an HTTP GET example?

[arunppsg]

So in these HTTP POST examples, the client should send the data to the server.

Ah, I see - I will think about this and get back on it.

However, I think this FastAPI + Uvicorn example would be a great addition to the HTTP GET examples. May I make some changes to this PR to turn it into an HTTP GET example?

Feel free to make the necessary changes for HTTP GET in this PR.

[ianmcook]

I moved the FastAPI + Uvicorn server piece of this to #37 (with some small changes).