feat: Add Asynchronous Web Requests

[mertemr]

This PR migrates from synchronous requests to asynchronous httpx for making HTTP requests to PyPI, aiming to improve performance by enabling concurrent API calls when resolving package information.

• Replaced requests with httpx for asynchronous HTTP requests
• Added async/await pattern to get_imports_info and init functions
• Implemented concurrent requests using asyncio.gather() for better performance

Transition to Asynchronous Code:

• Refactored get_imports_info to an asynchronous function (async def) and split out _get_response as a helper function for making asynchronous HTTP requests using httpx. This allows concurrent fetching of package data from PyPI, improving performance.
• Updated the init function to be asynchronous and used asyncio.run in the main function to execute it, enabling the integration of asynchronous workflows throughout the application. [1] [2]
• Modified the call to get_imports_info in init to use await, ensuring proper handling of asynchronous operations.

Library Replacement:

• Replaced the requests library with httpx for HTTP requests, enabling asynchronous request handling and modernizing the codebase.

[Copilot]

Pull Request Overview

This PR migrates the HTTP request handling from synchronous requests to asynchronous httpx to improve performance when fetching package information from PyPI through concurrent API calls.

Key changes include:

• Replaced requests library with httpx for asynchronous HTTP requests
• Refactored get_imports_info to use async/await pattern with concurrent request handling
• Updated the application flow to support asynchronous execution throughout

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
pyproject.toml	Added httpx dependency for asynchronous HTTP requests
pipreqs/pipreqs.py	Migrated from synchronous requests to async httpx with concurrent request handling

Comments suppressed due to low confidence (2)

pyproject.toml:34

• The httpx version 0.28.1 does not exist. The latest stable version of httpx is 0.27.x. Consider using a valid version range like "httpx>=0.27.0,<0.28.0".

    "httpx (>=0.28.1,<0.29.0)",

pipreqs/pipreqs.py:252

• The variable name 'requests' is confusing as it shadows the previously used requests library name and doesn't clearly indicate it stores asyncio tasks. Consider renaming to 'tasks' or 'request_tasks'.

    requests = []

[Copilot]

The HTTPError constructor is being called with 'url' parameter, but the original yarg HTTPError exception likely expects 'reason' parameter instead. This could cause a TypeError at runtime.

Suggested change

	raise HTTPError(status_code=response.status_code, url=url)
	raise HTTPError(status_code=response.status_code, reason=f"Failed to fetch {url}")

[Copilot]

The success logging message that was present in the original code (lines about 'Import named "%s" was resolved to "%s:%s"') has been removed, which reduces visibility into successful package resolutions for debugging purposes.

Suggested change

	requests.append(asyncio.create_task(_get_response(client, f"{item}/json")))
	requests.append(asyncio.create_task(_get_response(client, f"{item}/json", item)))