curl_cffi
library to enable bypassing restrictions and streaming responses from various providers. This document explains how curl_cffi
works under the hood and how we utilize it in g4f to enhance the functionality.
What is curl_cffi?
curl_cffi
is a Python library that provides a convenient interface to the libcurl C library. It allows making HTTP requests with advanced options and fine-grained control over the request and response handling.
Key Features of curl_cffi
Key Features of curl_cffi
- Supports all HTTP methods (GET, POST, PUT, DELETE, etc.)
- Handles cookies and authentication
- Allows setting custom headers and request bodies
- Provides proxy support
- Enables streaming responses
How curl_cffi Works
Under the hood,curl_cffi
uses the libcurl C library to perform the actual HTTP requests. It provides a Pythonic interface to interact with libcurl, abstracting away the low-level details.
1
Step 1: Initialize Session
Create a
Session
object from curl_cffi.requests
to manage the HTTP session.2
Step 2: Configure Request
Set the desired options for the request, such as URL, method, headers, cookies, etc.
3
Step 3: Send Request
Call the appropriate method (
get()
, post()
, etc.) on the Session
object to send the request.4
Step 4: Handle Response
Process the response returned by the server, which can be accessed through the
Response
object.Bypassing with curl_cffi in G4F
G4F takes advantage ofcurl_cffi
’s capabilities to bypass certain restrictions imposed by providers. Here’s how it works:
Bypassing Cloudflare
Bypassing Cloudflare
Some providers use Cloudflare protection to prevent automated requests. G4F uses
curl_cffi
along with a headless browser (e.g., Selenium) to solve the Cloudflare challenge and obtain the necessary cookies and headers to make successful requests.Impersonating Browsers
Impersonating Browsers
To mimic human-like behavior and avoid detection, G4F can impersonate popular browsers like Chrome or Firefox.
curl_cffi
allows setting custom user agent strings and headers to disguise the requests as originating from a browser.Streaming Responses with curl_cffi in G4F
G4F leveragescurl_cffi
’s streaming capabilities to handle responses that are delivered in chunks. This is particularly useful for providers that support streaming, as it allows processing the response data incrementally without waiting for the entire response to be received.
The
StreamResponse
and StreamSession
classes in G4F wrap the curl_cffi
response and session objects, respectively, to provide a convenient interface for handling streaming responses.Conclusion
By leveraging the power ofcurl_cffi
, G4F is able to bypass restrictions, impersonate browsers, and handle streaming responses efficiently. This enables seamless integration with various providers and enhances the overall functionality of the library.
Make sure to install the
curl_cffi
package to take advantage of these features in G4F: