1<!-- 2Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3 4SPDX-License-Identifier: curl 5--> 6 7# Items to be removed from future curl releases 8 9If any of these deprecated features is a cause for concern for you, please 10email the 11[curl-library mailing list](https://lists.haxx.se/listinfo/curl-library) 12as soon as possible and explain to us why this is a problem for you and 13how your use case cannot be satisfied properly using a workaround. 14 15## TLS libraries without 1.3 support 16 17curl drops support for TLS libraries without TLS 1.3 capability after May 182025. 19 20It requires that a curl build using the library should be able to negotiate 21and use TLS 1.3, or else it is not good enough. 22 23As of May 2024, the libraries that need to get fixed to remain supported after 24May 2025 are: BearSSL and Secure Transport. 25 26## Hyper 27 28Hyper is an alternative HTTP backend for curl. It uses the hyper library and 29could in theory be used for HTTP/1, HTTP/2 and even HTTP/3 in the future with 30curl. 31 32The original plan and goal was that we would add this HTTP alternative (using 33a memory-safe library) and that users could eventually build and use libcurl 34exactly as previously but with parts of the core being more memory-safe. 35 36The hyper implementation ran into some snags and 10-15 tests and HTTP/2 37support have remained disabled with hyper. For these reasons, hyper support 38has remained tagged EXPERIMENTAL. 39 40It is undoubtedly hard work to fix these remaining problems, as they typically 41require both rust and C knowledge in addition to deep HTTP familiarity. There 42does not seem to be that many persons interested or available for this 43challenge. Meanwhile, there is little if any demand for hyper from existing 44(lib)curl users. 45 46Finally: having support for hyper in curl has a significant cost: we need to 47maintain and develop a lot of functionality and tests twice to make sure 48libcurl works identically using either HTTP backend. 49 50The only way to keep hyper support in curl is to give it a good polish by 51someone with time, skill and energy to spend on this task. 52 53Unless a significant overhaul has proven to be in progress, hyper support is 54removed from curl in January 2025. 55 56## Past removals 57 58 - Pipelining 59 - axTLS 60 - PolarSSL 61 - NPN 62 - Support for systems without 64-bit data types 63 - NSS 64 - gskit 65 - MinGW v1 66 - NTLM_WB 67 - space-separated `NOPROXY` patterns 68
