## 📋 Pull Request Information **Original PR:** https://github.com/open-webui/open-webui/pull/24822 **Author:** [@JawafdehiBot](https://github.com/JawafdehiBot) **Created:** 5/17/2026 **Status:** 🔄 Open **Base:** `dev` ← **Head:** `upstream/mcp-header-interpolation-v2` --- ### 📝 Commits (1) - [`829d294`](https://github.com/open-webui/open-webui/commit/829d29440fc01088e1c3281d31115d5a29475813) fix: interpolate template vars in MCP connection headers ### 📊 Changes **1 file changed** (+3 additions, -3 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/utils/middleware.py` (+3 -3) </details> ### 📄 Description # Pull Request Checklist - [ ] **Linked Issue/Discussion:** — - [x] **Target branch:** Verify that the pull request targets the `dev` branch. **PRs targeting `main` will be immediately closed.** - [x] **Description:** Provide a concise description of the changes made in this pull request down below. - [x] **Changelog:** Ensure a changelog entry following the format of [Keep a Changelog](https://keepachangelog.com/) is added at the bottom of the PR description. - [x] **Documentation:** Add docs in [Open WebUI Docs Repository](https://github.com/open-webui/docs). Document user-facing behavior, environment variables, public APIs/interfaces, or deployment steps. - [x] **Dependencies:** Are there any new or upgraded dependencies? If so, explain why, update the changelog/docs, and include any compatibility notes. Actually run the code/function that uses updated library to ensure it doesn't crash. - [x] **Testing:** Perform manual tests to **verify the implemented fix/feature works as intended AND does not break any other functionality**. Include reproducible steps to demonstrate the issue before the fix. Test edge cases (URL encoding, HTML entities, types). Take this as an opportunity to **make screenshots of the feature/fix and include them in the PR description**. - [x] **Agentic AI Code:** Confirm this Pull Request is **not written by any AI Agent** or has at least **gone through additional human review AND manual testing**. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR. - [x] **Code review:** Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards? - [x] **Design & Architecture:** Prefer smart defaults over adding new settings; use local state for ephemeral UI logic. Open a Discussion for major architectural or UX changes. - [x] **Git Hygiene:** Keep PRs atomic (one logical change). Clean up commits and rebase on `dev` to ensure no unrelated commits (e.g. from `main`) are included. Push updates to the existing PR branch instead of closing and reopening. - [x] **Title Prefix:** To clearly categorize this pull request, prefix the pull request title using one of the following: - **fix**: Bug fix or error correction # Changelog Entry ### Description OpenWebUI middleware.py applies MCP connection custom headers directly without calling `get_custom_headers()`, so template variables like `{{USER_ID}}` and `{{USER_NAME}}` are sent literally to MCP servers. ### Fixed - MCP connection custom headers now support template variable interpolation (`{{USER_ID}}`, `{{USER_NAME}}`, `{{CHAT_ID}}`, `{{MESSAGE_ID}}`) via `get_custom_headers()` --- ### Additional Information - The fix follows the same pattern already used in `tools.py` for OpenAPI tool servers ### Contributor License Agreement - [x] By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms. > [!NOTE] > Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror commented

2026-05-18 16:08:02 -05:00

Owner

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/24822
Author: @JawafdehiBot
Created: 5/17/2026
Status: 🔄 Open

Base: dev ← Head: upstream/mcp-header-interpolation-v2

📝 Commits (1)

829d294 fix: interpolate template vars in MCP connection headers

📊 Changes

1 file changed (+3 additions, -3 deletions)

View changed files

📝 backend/open_webui/utils/middleware.py (+3 -3)

📄 Description

Pull Request Checklist

Linked Issue/Discussion: —
Target branch: Verify that the pull request targets the dev branch. PRs targeting main will be immediately closed.
Description: Provide a concise description of the changes made in this pull request down below.
Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
Documentation: Add docs in Open WebUI Docs Repository. Document user-facing behavior, environment variables, public APIs/interfaces, or deployment steps.
Dependencies: Are there any new or upgraded dependencies? If so, explain why, update the changelog/docs, and include any compatibility notes. Actually run the code/function that uses updated library to ensure it doesn't crash.
Testing: Perform manual tests to verify the implemented fix/feature works as intended AND does not break any other functionality. Include reproducible steps to demonstrate the issue before the fix. Test edge cases (URL encoding, HTML entities, types). Take this as an opportunity to make screenshots of the feature/fix and include them in the PR description.
Agentic AI Code: Confirm this Pull Request is not written by any AI Agent or has at least gone through additional human review AND manual testing. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR.
Code review: Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards?
Design & Architecture: Prefer smart defaults over adding new settings; use local state for ephemeral UI logic. Open a Discussion for major architectural or UX changes.
Git Hygiene: Keep PRs atomic (one logical change). Clean up commits and rebase on dev to ensure no unrelated commits (e.g. from main) are included. Push updates to the existing PR branch instead of closing and reopening.
Title Prefix: To clearly categorize this pull request, prefix the pull request title using one of the following:
- fix: Bug fix or error correction

Changelog Entry

Description

OpenWebUI middleware.py applies MCP connection custom headers directly without calling get_custom_headers(), so template variables like {{USER_ID}} and {{USER_NAME}} are sent literally to MCP servers.

Fixed

MCP connection custom headers now support template variable interpolation ({{USER_ID}}, {{USER_NAME}}, {{CHAT_ID}}, {{MESSAGE_ID}}) via get_custom_headers()

Additional Information

The fix follows the same pattern already used in tools.py for OpenAPI tool servers

Contributor License Agreement

By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.

Note

Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

GiteaMirror added the pull-request label 2026-05-18 16:08:02 -05:00

[PR #24822] fix: interpolate template vars in MCP connection headers #115181