<!--- Please read this! Before opening a new issue, make sure to search for keywords in the issues filtered by the "regression" or "type::bug" label: - https://gitlab.com/gitlab-org/gitlab/issues?label_name%5B%5D=regression - https://gitlab.com/gitlab-org/gitlab/issues?label_name%5B%5D=type::bug and verify the issue you're about to submit isn't a duplicate. ---> ### Summary Using webhook with a literal bracketed IPv6 URL such as `https://[2001:db8::1]:8080/path` fails when outbound proxy settings are configured, even if that IPv6 destination is added to `no_proxy`. The same endpoint works in both of these cases: - When proxy settings are removed - When the endpoint is accessed through a hostname with a corresponding AAAA record ### Steps to reproduce 1. Configure an instance with working IPv6 and outbound proxy settings in `gitlab_rails['env']`, `http_proxy`, `https_proxy`, and `no_proxy` . 2. Create a project webhook pointing to a literal IPv6 HTTPS URL, for example: `https://[2001:db8::1]:8080/path` 3. Add the literal IPv6 destination to `no_proxy` and reconfigure GitLab. 4. In the project webhook UI, run Test. 5. Compare that result with cases: - Remove proxy settings entirely and test the same literal IPv6 URL again. - Use a hostname with a AAAA record pointing to the same IPv6 endpoint and test again with proxy settings enabled. ### What is the current _bug_ behavior? If a literal IPv6 webhook target is used while proxy settings are enabled, testing the webhook returns a GitLab UI 500 instead of bypassing the proxy. ### What is the expected _correct_ behavior? If a literal IPv6 webhook target is included in no_proxy, the webhook test should bypass the proxy and succeed. Small but important improvement: ### Workaround: * Use a hostname for the webhook target instead of the raw IPv6 address, and point that hostname to the same endpoint with a AAAA record. * Alternatively, removing the outbound proxy settings works ### Relevant logs and/or screenshots <details> <summary> Expand for redacted customer log excerpt from `gitlab-rails/production_json.log` during `Projects::HooksController#test`: </summary> ``` /var/log/gitlab/gitlab-rails/production_json.log:119183: { "method": "POST", "path": "<REDACTED>/-/hooks/<REDACTED>/test", "format": "html", "controller": "Projects::HooksController", "action": "test", "status": 500, "time": "2026-03-11T11:05:36.448Z", "params": [ { "key": "_method", "value": "post" }, { "key": "authenticity_token", "value": "[FILTERED]" }, { "key": "trigger", "value": "push_events" }, { "key": "namespace_id", "value": "<REDACTED>" }, { "key": "project_id", "value": "<REDACTED>" }, { "key": "id", "value": "<REDACTED>" } ], 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"db_replica_write_count": 0, "db_primary_write_count": 0, "db_replica_cached_count": 0, "db_primary_cached_count": 2, "db_replica_wal_count": 0, "db_primary_wal_count": 0, "db_replica_wal_cached_count": 0, "db_primary_wal_cached_count": 0, "db_replica_txn_max_duration_s": 0.0, "db_primary_txn_max_duration_s": 0.0, "db_replica_txn_duration_s": 0.0, "db_primary_txn_duration_s": 0.0, "db_replica_duration_s": 0.0, "db_primary_duration_s": 0.015, "db_main_txn_count": 0, "db_ci_txn_count": 0, "db_main_replica_txn_count": 0, "db_ci_replica_txn_count": 0, "db_main_count": 19, "db_ci_count": 0, "db_main_replica_count": 0, "db_ci_replica_count": 0, "db_main_write_count": 0, "db_ci_write_count": 0, "db_main_replica_write_count": 0, "db_ci_replica_write_count": 0, "db_main_cached_count": 2, "db_ci_cached_count": 0, "db_main_replica_cached_count": 0, "db_ci_replica_cached_count": 0, "db_main_wal_count": 0, "db_ci_wal_count": 0, "db_main_replica_wal_count": 0, "db_ci_replica_wal_count": 0, "db_main_wal_cached_count": 0, "db_ci_wal_cached_count": 0, "db_main_replica_wal_cached_count": 0, "db_ci_replica_wal_cached_count": 0, "db_main_txn_max_duration_s": 0.0, "db_ci_txn_max_duration_s": 0.0, "db_main_replica_txn_max_duration_s": 0.0, "db_ci_replica_txn_max_duration_s": 0.0, "db_main_txn_duration_s": 0.0, "db_ci_txn_duration_s": 0.0, "db_main_replica_txn_duration_s": 0.0, "db_ci_replica_txn_duration_s": 0.0, "db_main_duration_s": 0.015, "db_ci_duration_s": 0.0, "db_main_replica_duration_s": 0.0, "db_ci_replica_duration_s": 0.0, "path_traversal_check_duration_s": 0.000263, "cpu_s": 0.165959, "mem_objects": 135519, "mem_bytes": 10634144, "mem_mallocs": 16286, "mem_total_bytes": 16054904, "pid": 436567, "worker_id": "puma_0", "rate_limiting_gates": [ "web_hook_test" ], "exception.class": "Net::HTTPClientException", "exception.message": "400 \"Received invalid request line from client\"", "exception.backtrace": [ "net-http (0.6.0) lib/net/http/response.rb:277:in `error!'", 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"<REDACTED>/-/hooks/<REDACTED>/test?trigger=push_events", "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0", "written_bytes": 1624 } /var/log/gitlab/gitaly/current:91178: { "catfile.duration_ms": 0, "catfile.flush_count": 3, "catfile.flush_ms": 0, "catfile.read_object_count": 3, "catfile.read_object_ms": 0, "catfile.request_object_count": 3, "catfile.request_object_ms": 0, "command.count": 1, "command.cpu_time_ms": 1, "command.inblock": 0, "command.majflt": 0, "command.maxrss": 409088, "command.minflt": 435, "command.oublock": 0, "command.real_time_ms": 3, "command.spawn_token_fork_ms": 0, "command.system_time_ms": 0, "command.user_time_ms": 1, "component": "gitaly.StreamServerInterceptor", "correlation_id": "01KKE95N6AQB885SPA66M8F3FA", "grpc.code": "OK", "grpc.meta.auth_version": "v2", "grpc.meta.client_name": "gitlab-web", "grpc.meta.deadline_type": "regular", "grpc.meta.method_operation": "accessor", "grpc.meta.method_scope": "repository", "grpc.meta.method_type": "server_stream", "grpc.method": "FindCommits", "grpc.request.deadline": "2026-03-11T12:06:06.085", "grpc.request.fullMethod": "/gitaly.CommitService/FindCommits", "grpc.request.glProjectPath": "<REDACTED>", "grpc.request.glRepository": "<REDACTED>", "grpc.request.payload_bytes": 154, "grpc.request.repoPath": "@hashed/<REDACTED>.git", "grpc.request.repoStorage": "default", "grpc.response.payload_bytes": 1007, "grpc.service": "gitaly.CommitService", "grpc.start_time": "2026-03-11T12:05:36.285", "grpc.time_ms": 4.078, "level": "info", "msg": "finished streaming call with code OK", "pid": 1498, "remote_ip": "<REDACTED>", "span.kind": "server", "system": "grpc", "time": "2026-03-11T11:05:36.289Z", "username": "jasper.lorenz" } /var/log/gitlab/gitaly/current:91181: { "command.count": 1, "command.cpu_time_ms": 2, "command.inblock": 304, "command.majflt": 1, "command.maxrss": 409088, "command.minflt": 491, "command.oublock": 0, "command.real_time_ms": 7, "command.spawn_token_fork_ms": 0, "command.system_time_ms": 2, "command.user_time_ms": 0, "component": "gitaly.StreamServerInterceptor", "correlation_id": "01KKE95N6AQB885SPA66M8F3FA", "grpc.code": "OK", "grpc.meta.auth_version": "v2", "grpc.meta.client_name": "gitlab-web", "grpc.meta.deadline_type": "regular", "grpc.meta.method_operation": "accessor", "grpc.meta.method_scope": "repository", "grpc.meta.method_type": "server_stream", "grpc.method": "CommitDelta", "grpc.request.deadline": "2026-03-11T12:05:46.134", "grpc.request.fullMethod": "/gitaly.DiffService/CommitDelta", "grpc.request.glProjectPath": "<REDACTED>", "grpc.request.glRepository": "project-<REDACTED>", "grpc.request.payload_bytes": 224, "grpc.request.repoPath": "@hashed/<REDACTED>.git", "grpc.request.repoStorage": "default", "grpc.response.payload_bytes": 84159, "grpc.service": "gitaly.DiffService", "grpc.start_time": "2026-03-11T12:05:36.294", "grpc.time_ms": 7.808, "level": "info", "msg": "finished streaming call with code OK", "pid": 1498, "remote_ip": "<REDACTED>", "span.kind": "server", "system": "grpc", "time": "2026-03-11T11:05:36.302Z", "username": "jasper.lorenz" } /var/log/gitlab/gitaly/current:91182: { "command.count": 1, "command.cpu_time_ms": 3, "command.inblock": 8, "command.majflt": 1, "command.maxrss": 409088, "command.minflt": 523, "command.oublock": 0, "command.real_time_ms": 8, "command.spawn_token_fork_ms": 0, "command.system_time_ms": 1, "command.user_time_ms": 2, "component": "gitaly.StreamServerInterceptor", "correlation_id": "01KKE95N6AQB885SPA66M8F3FA", "grpc.code": "OK", "grpc.meta.auth_version": "v2", "grpc.meta.client_name": "gitlab-web", "grpc.meta.deadline_type": "regular", "grpc.meta.method_operation": "accessor", "grpc.meta.method_scope": "repository", "grpc.meta.method_type": "server_stream", "grpc.method": "CommitDelta", "grpc.request.deadline": "2026-03-11T12:05:46.160", "grpc.request.fullMethod": "/gitaly.DiffService/CommitDelta", "grpc.request.glProjectPath": "<REDACTED>", "grpc.request.glRepository": "project-<REDACTED>", "grpc.request.payload_bytes": 224, "grpc.request.repoPath": "@hashed/<REDACTED>.git", "grpc.request.repoStorage": "default", "grpc.response.payload_bytes": 77647, "grpc.service": "gitaly.DiffService", "grpc.start_time": "2026-03-11T12:05:36.320", "grpc.time_ms": 8.621, "level": "info", "msg": "finished streaming call with code OK", "pid": 1498, "remote_ip": "<REDACTED>", "span.kind": "server", "system": "grpc", "time": "2026-03-11T11:05:36.329Z", "username": "jasper.lorenz" } /var/log/gitlab/gitaly/current:91183: { "command.count": 1, "command.cpu_time_ms": 1, "command.inblock": 0, "command.majflt": 0, "command.maxrss": 409088, "command.minflt": 443, "command.oublock": 0, "command.real_time_ms": 3, "command.spawn_token_fork_ms": 0, "command.system_time_ms": 1, "command.user_time_ms": 0, "component": "gitaly.StreamServerInterceptor", "correlation_id": "01KKE95N6AQB885SPA66M8F3FA", "grpc.code": "OK", "grpc.meta.auth_version": "v2", "grpc.meta.client_name": "gitlab-web", "grpc.meta.deadline_type": "regular", "grpc.meta.method_operation": "accessor", "grpc.meta.method_scope": "repository", "grpc.meta.method_type": "server_stream", "grpc.method": "CommitDelta", "grpc.request.deadline": "2026-03-11T12:05:46.189", "grpc.request.fullMethod": "/gitaly.DiffService/CommitDelta", "grpc.request.glProjectPath": "<REDACTED>", "grpc.request.glRepository": "project-<REDACTED>", "grpc.request.payload_bytes": 224, "grpc.request.repoPath": "@hashed/<REDACTED>.git", "grpc.request.repoStorage": "default", "grpc.response.payload_bytes": 118, "grpc.service": "gitaly.DiffService", "grpc.start_time": "2026-03-11T12:05:36.350", "grpc.time_ms": 3.709, "level": "info", "msg": "finished streaming call with code OK", "pid": 1498, "remote_ip": "<REDACTED>", "span.kind": "server", "system": "grpc", "time": "2026-03-11T11:05:36.353Z", "username": "jasper.lorenz" } /var/log/gitlab/gitaly/current:91184: { "command.count": 2, "command.cpu_time_ms": 2, "command.inblock": 0, "command.majflt": 0, "command.maxrss": 409088, "command.minflt": 557, "command.oublock": 0, "command.real_time_ms": 2, "command.spawn_token_fork_ms": 0, "command.system_time_ms": 2, "command.user_time_ms": 0, "component": "gitaly.StreamServerInterceptor", "correlation_id": "01KKE95N6AQB885SPA66M8F3FA", "grpc.code": "OK", "grpc.meta.auth_version": "v2", "grpc.meta.client_name": "gitlab-web", "grpc.meta.deadline_type": "regular", "grpc.meta.method_operation": "accessor", "grpc.meta.method_scope": "repository", "grpc.meta.method_type": "server_stream", "grpc.method": "ListRefs", "grpc.request.deadline": "2026-03-11T12:05:46.197", "grpc.request.fullMethod": "/gitaly.RefService/ListRefs", "grpc.request.glProjectPath": "<REDACTED>", "grpc.request.glRepository": "project-<REDACTED>", "grpc.request.payload_bytes": 152, "grpc.request.repoPath": "@hashed/<REDACTED>.git", "grpc.request.repoStorage": "default", "grpc.response.payload_bytes": 0, "grpc.service": "gitaly.RefService", "grpc.start_time": "2026-03-11T12:05:36.357", "grpc.time_ms": 4.243, "level": "info", "msg": "finished streaming call with code OK", "pid": 1498, "remote_ip": "<REDACTED>", "span.kind": "server", "system": "grpc", "time": "2026-03-11T11:05:36.361Z", "username": "jasper.lorenz" } ``` </details> ### Output of checks <!--If you are reporting a bug on GitLab.com, uncomment below--> <!--This bug happens on GitLab.com--> <!--and uncomment below if you have /label privileges--> <!--/label ~"reproduced on GitLab.com"--> <!--or follow up with an issue comment of `@gitlab-bot label ~"reproduced on GitLab.com"` if you do not--> #### Results of GitLab environment info <!--Input any relevant GitLab environment information if needed.--> <details> <summary>Expand for output related to GitLab environment info</summary> <pre> \\\* GitLab version: 18.8.5 \\\* IPv6-only </pre> </details> #### Results of GitLab application Check <!--Input any relevant GitLab application check information if needed.--> <details> <summary>Expand for output related to the GitLab application check</summary> <pre> (For installations with omnibus-gitlab package run and paste the output of: \\\`sudo gitlab-rake gitlab:check SANITIZE=true\\\`) (For installations from source run and paste the output of: \\\`sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true\\\`) (we will only investigate if the tests are passing) </pre> </details> ### Possible fixes <!--If you can, link to the line of code that might be responsible for the problem.--> ### Patch release information for backports If the bug fix needs to be backported in a [patch release](https://handbook.gitlab.com/handbook/engineering/releases/patch-releases) to a version under [the maintenance policy](https://docs.gitlab.com/policy/maintenance/), please follow the steps on the [patch release runbook for GitLab engineers](https://gitlab.com/gitlab-org/release/docs/-/blob/master/general/patch/engineers.md). Refer to the [internal "Release Information" dashboard](https://dashboards.gitlab.net/d/delivery-release_info/delivery3a-release-information?orgId=1) for information about the next patch release, including the targeted versions, expected release date, and current status. #### High-severity bug remediation To remediate high-severity issues requiring an [internal release](https://handbook.gitlab.com/handbook/engineering/releases/internal-releases/) for single-tenant SaaS instances, refer to the [internal release process for engineers](https://gitlab.com/gitlab-org/release/docs/-/blob/master/general/internal-releases/engineers.md?ref_type=heads). <!--If you don't have /label privileges, follow up with an issue comment of `@gitlab-bot label ~"type::bug"`-->