Impersonate Guide

You probably come across curl_cffi for it’s ability to impersonate browsers. Here is a tutorial on how to better impersonate using curl_cffi.

Contents:

• What is TLS and http/2, http/3 fingerprinting?
  • TLS and http/2
  • http/3
• JA4 support in curl-cffi
  • What JA3 Already Gives You
  • What JA4 Adds, and Why That Is Not Very Useful
  • Mixing Text and Hashes Is a Bad Design
  • Conclusion
  • References
• Supported browser impersonate targets
• Which target version to use?
• How to use my own fingerprints? e.g. okhttp
  • JA3 and Akamai String Format
  • Using CURLOPTs
  • How to toggle firefox-specific extensions?
• TLS PSK(41) Extension
  • How do I enable PSK extension anyway?
• Impersonation FAQ
  • How to check if my impersonation is working?
  • I’m still being detected even if I impersonated correctly
  • Should I randomize my fingerprints for each request?
  • Can I change JavaScript fingerprints with this library?
  • Why are all the User-Agents macOS?