feat!: pluggable HTTP backend – httpx or curl-cffi (#269)

[vladkens]

Summary

Introduces a pluggable HTTP backend layer (twscrape/http.py) so the library can use either httpx (existing default) or curl-cffi for requests. curl-cffi uses libcurl with browser-level TLS fingerprint spoofing, which helps bypass Cloudflare bot detection.

• pip install twscrape — works as before (httpx)
• pip install twscrape[curl] — enables curl-cffi, preferred automatically when present
• TWS_HTTP_BACKEND=httpx|curl — force a specific backend

Changes

New twscrape/http.py — unified HttpClient interface wrapping both backends:

• HttpxClient / CurlClient — backend implementations
• Response — thin wrapper normalising httpx.Response and curl_cffi.Response to one API
• _detect_backend() — auto-selects curl if installed, falls back to httpx
• Normalised exceptions: ConnectError, NetworkError, HttpStatusError

account.py — make_client() now returns HttpClient instead of httpx.AsyncClient

queue_client.py — replaced direct httpx error types with ConnectError / NetworkError from the new abstraction

Breaking change

Raw API methods (e.g. search_raw) now return twscrape.Response instead of httpx.Response. The interface is compatible (.status_code, .json(), .text, .headers), but direct isinstance(rep, httpx.Response) checks will break.

Tests

• tests/test_http.py (new) — full coverage of both backends, all error-mapping paths, _detect_backend, make_client
• tests/mock_http.py (new) — MockClient for integration tests without a real HTTP server
• test_queue_client.py — added branches: error code 131, _Missing, Authorization passthrough, unknown error, unhandled 5xx, JSON decode fallback, 404 retry, unknown-exception retry
• test_pool.py — delete_accounts, reset_locks, mark_inactive, next_available_at, accounts_info sorting, load_from_file, get_for_queue_or_wait raise-on-no-account

http.py: 100% | queue_client.py: 69→83% | accounts_pool.py: 55→76%

[Copilot]

Pull request overview

This PR introduces a pluggable HTTP layer for twscrape, replacing direct httpx usage with a unified HttpClient/Response abstraction and adding an optional curl-cffi backend (auto-preferred when installed, or selectable via TWS_HTTP_BACKEND).

Changes:

• Added twscrape.http with HttpxClient/CurlClient, unified Response, and backend auto-detection + env override.
• Migrated internal call sites (API/raw paths, login, queue client, xclid, CLI) from httpx types to the new wrapper types.
• Updated packaging/docs/tests to support the new backend model (twscrape[curl], new unit tests, removed pytest-httpx).

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Adds curl-cffi (and deps), removes pytest-httpx, updates extras/dev deps accordingly.
pyproject.toml	Defines curl extra, updates dev dependency group, adjusts pyright include.
readme.md	Documents the new optional curl backend and TWS_HTTP_BACKEND.
twscrape/http.py	New HTTP abstraction layer + backend detection/selection.
twscrape/account.py	Switches account client creation to make_client() and unified headers/cookies setup.
twscrape/queue_client.py	Replaces httpx exceptions/types with twscrape.http equivalents.
twscrape/login.py	Switches login flow to use HttpClient/Response.
twscrape/models.py	Updates parsing helpers to accept twscrape.Response.
twscrape/xclid.py	Switches page/script fetches to HttpClient.
twscrape/api.py	Updates raw response type to twscrape.Response.
twscrape/accounts_pool.py	Updates status error handling to use HttpStatusError.
twscrape/cli.py	Updates --raw printing path to accept twscrape.Response.
scripts/update_gql_ops.py	Switches script downloader to make_client() for pluggable backend support.
tests/mock_http.py	Adds a small HttpClient mock for deterministic tests without pytest-httpx.
tests/conftest.py	Monkeypatches Account.make_client() to use MockClient, adjusts log level.
tests/test_http.py	Adds coverage for both backends + backend detection + wrapper behavior.
tests/test_queue_client.py	Reworks tests to use MockClient and adds many additional branch tests.
tests/test_pool.py	Adds coverage for pool maintenance behaviors and no-account error paths.
tests/test_utils.py	Adds coverage for get_env_bool and new-schema flattening via to_old_obj.

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