| <!-- | |
| Copyright (C) Daniel Stenberg, <[email protected]>, et al. | |
| SPDX-License-Identifier: curl | |
| --> | |
| # Items to be removed from future curl releases | |
| If any of these deprecated features is a cause for concern for you, please | |
| email the | |
| [curl-library mailing list](https://lists.haxx.se/listinfo/curl-library) | |
| as soon as possible and explain to us why this is a problem for you and | |
| how your use case cannot be satisfied properly using a workaround. | |
| ## TLS libraries without 1.3 support | |
| curl drops support for TLS libraries without TLS 1.3 capability after May | |
| 2025. | |
| It requires that a curl build using the library should be able to negotiate | |
| and use TLS 1.3, or else it is not good enough. | |
| As of May 2024, the libraries that need to get fixed to remain supported after | |
| May 2025 are: BearSSL and Secure Transport. | |
| ## Hyper | |
| Hyper is an alternative HTTP backend for curl. It uses the hyper library and | |
| could in theory be used for HTTP/1, HTTP/2 and even HTTP/3 in the future with | |
| curl. | |
| The original plan and goal was that we would add this HTTP alternative (using | |
| a memory-safe library) and that users could eventually build and use libcurl | |
| exactly as previously but with parts of the core being more memory-safe. | |
| The hyper implementation ran into some snags and 10-15 tests and HTTP/2 | |
| support have remained disabled with hyper. For these reasons, hyper support | |
| has remained tagged EXPERIMENTAL. | |
| It is undoubtedly hard work to fix these remaining problems, as they typically | |
| require both rust and C knowledge in addition to deep HTTP familiarity. There | |
| does not seem to be that many persons interested or available for this | |
| challenge. Meanwhile, there is little if any demand for hyper from existing | |
| (lib)curl users. | |
| Finally: having support for hyper in curl has a significant cost: we need to | |
| maintain and develop a lot of functionality and tests twice to make sure | |
| libcurl works identically using either HTTP backend. | |
| The only way to keep hyper support in curl is to give it a good polish by | |
| someone with time, skill and energy to spend on this task. | |
| Unless a significant overhaul has proven to be in progress, hyper support is | |
| removed from curl in January 2025. | |
| ## Past removals | |
| - Pipelining | |
| - axTLS | |
| - PolarSSL | |
| - NPN | |
| - Support for systems without 64-bit data types | |
| - NSS | |
| - gskit | |
| - MinGW v1 | |
| - NTLM_WB | |
| - space-separated `NOPROXY` patterns | |