Issue #20247 has been updated by austin (Austin Ziegler). This should be reported upstream: https://github.com/ruby/net-http and can be found at https://github.com/ruby/net-http/commit/c245f7f9c845f1e7534b4e50b69e94ca9d08.... Based on my reading (https://www.geekersdigest.com/max-http-request-header-size-server-comparison... was useful), I do not believe that there should be a separate limit (key 1024 + 65536 value), but that if a limit is to be enforced, it should: 1. Be based on the combined length `key.bytesize + value.bytesize > OVERALL_LIMIT` 2. Be configurable 3. Optionally be as generous as the Golang (1Mib) for the default value. ---------------------------------------- Bug #20247: net/http/header limits are too low https://bugs.ruby-lang.org/issues/20247#change-106641 * Author: dpsi (Darien Imai) * Status: Open * Priority: Normal * ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) +YJIT [x86_64-linux] * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Hello, some of my HTTP tests are failing on Ruby 3.3 due to ArgumentError too long. I am trying to update from Ruby 2.7. I did not see any mention of this change in the net/http changelog, but looking at git history, the limit was added between gem versions 0.3.2 and 0.4.0. https://github.com/ruby/ruby/commit/d8b8294c28a09278de357c26b291abf1b9f3cc5d I send HTTP requests with long header keys in my testing suite. Many webservers such as apache, nginx, IIS permit the total length of HTTP headers to be 8K or longer. Tomcat for example allows 48K. I am trying to send a request with a header key length of 24K. I think the limit of 1K is too low. There was not a clear reason for the change, so I request that it gets reverted. Alternatively the limit could be configurable. The code being affected by the limit was written for Ruby 1.8, so I am surprised such longstanding behaviour was removed without being listed in the changelog. -- https://bugs.ruby-lang.org/