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[GH-ISSUE #21179] issue: [Bug] Web UI Trims Trailing Slash from MCP Server URL, Causing 301 Redirect and Broken Authorization #34941

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opened 2026-04-25 09:07:14 -05:00 by GiteaMirror · 1 comment
GiteaMirror commented 2026-04-25 09:07:14 -05:00
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Originally created by @ianohin on GitHub (Feb 5, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/21179

Check Existing Issues

  • I have searched for any existing and/or related issues.
  • I have searched for any existing and/or related discussions.
  • I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
  • I am using the latest version of Open WebUI.

Installation Method

Git Clone

Open WebUI Version

v0.7.2

Ollama Version (if applicable)

No response

Operating System

Ubuntu 24.04

Browser (if applicable)

No response

Confirmation

  • I have read and followed all instructions in README.md.
  • I am using the latest version of both Open WebUI and Ollama.
  • I have included the browser console logs.
  • I have included the Docker container logs.
  • I have provided every relevant configuration, setting, and environment variable used in my setup.
  • I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
  • I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
  • Start with the initial platform/version/OS and dependencies used,
  • Specify exact install/launch/configure commands,
  • List URLs visited, user input (incl. example values/emails/passwords if needed),
  • Describe all options and toggles enabled or changed,
  • Include any files or environmental changes,
  • Identify the expected and actual result at each stage,
  • Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

The URL entered by the user (https://api.example.com/mcp/) should be saved and used exactly as provided, preserving the trailing slash.

Actual Behavior

When configuring a Model Context Protocol (MCP) server via the OpenWebUI web interface, a trailing slash (/) at the end of the server URL is automatically removed upon saving. This causes the client to send requests to an incorrect endpoint, triggering a server-side redirect (301). During this redirect, critical authentication headers (like Authorization: Bearer) are lost or the request method changes, ultimately resulting in a 400 Bad Request error.

This is a critical issue for integrating with MCP servers (like Bitrix24) that strictly require a specific path format.

Steps to Reproduce

Go to the MCP servers configuration section in the OpenWebUI settings.

Add a new server with a URL that requires a trailing slash (e.g., https://api.example.com/mcp/).

Save the configuration.

Observe that the saved/displayed URL is now https://api.example.com/mcp (slash is missing).

Attempt to use this MCP server. The client will fail to connect, and the logs will show a 301 Moved Permanently followed by a 400 Bad Request.

Logs & Screenshots

docker logs

httpx._client:_send_single_request:1740 - HTTP Request: POST https://mcp.bitrix24.tech/mcp "HTTP/1.1 301 Moved Permanently"
httpx._client:_send_single_request:1740 - HTTP Request: GET https://mcp.bitrix24.tech/mcp/ "HTTP/1.1 400 Bad Request"

Additional Information

No response

Originally created by @ianohin on GitHub (Feb 5, 2026). Original GitHub issue: https://github.com/open-webui/open-webui/issues/21179 ### Check Existing Issues - [x] I have searched for any existing and/or related issues. - [x] I have searched for any existing and/or related discussions. - [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!). - [x] I am using the latest version of Open WebUI. ### Installation Method Git Clone ### Open WebUI Version v0.7.2 ### Ollama Version (if applicable) _No response_ ### Operating System Ubuntu 24.04 ### Browser (if applicable) _No response_ ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior The URL entered by the user (https://api.example.com/mcp/) should be saved and used exactly as provided, preserving the trailing slash. ### Actual Behavior When configuring a Model Context Protocol (MCP) server via the OpenWebUI web interface, a trailing slash (/) at the end of the server URL is automatically removed upon saving. This causes the client to send requests to an incorrect endpoint, triggering a server-side redirect (301). During this redirect, critical authentication headers (like Authorization: Bearer) are lost or the request method changes, ultimately resulting in a 400 Bad Request error. This is a critical issue for integrating with MCP servers (like Bitrix24) that strictly require a specific path format. ### Steps to Reproduce Go to the MCP servers configuration section in the OpenWebUI settings. Add a new server with a URL that requires a trailing slash (e.g., https://api.example.com/mcp/). Save the configuration. Observe that the saved/displayed URL is now https://api.example.com/mcp (slash is missing). Attempt to use this MCP server. The client will fail to connect, and the logs will show a 301 Moved Permanently followed by a 400 Bad Request. ### Logs & Screenshots docker logs httpx._client:_send_single_request:1740 - HTTP Request: POST https://mcp.bitrix24.tech/mcp "HTTP/1.1 301 Moved Permanently" httpx._client:_send_single_request:1740 - HTTP Request: GET https://mcp.bitrix24.tech/mcp/ "HTTP/1.1 400 Bad Request" ### Additional Information _No response_
GiteaMirror added the bug label 2026-04-25 09:07:14 -05:00
GiteaMirror commented 2026-04-25 09:07:15 -05:00
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@owui-terminator[bot] commented on GitHub (Feb 5, 2026):

🔍 Similar Issues Found

I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions:

  1. #20629 issue: MCP server response fails
    by thrasher • Jan 12, 2026 • bug

💡 Tips:

  • If this is a duplicate, please consider closing this issue and adding any additional details to the existing one
  • If you found a solution in any of these issues, please share it here to help others

This comment was generated automatically by a bot. Please react with a 👍 if this comment was helpful, or a 👎 if it was not.

<!-- gh-comment-id:3853633874 --> @owui-terminator[bot] commented on GitHub (Feb 5, 2026): 🔍 **Similar Issues Found** I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions: 1. [#20629](https://github.com/open-webui/open-webui/issues/20629) **issue: MCP server response fails** *by thrasher • Jan 12, 2026 • `bug`* --- 💡 **Tips:** - If this is a duplicate, please consider closing this issue and adding any additional details to the existing one - If you found a solution in any of these issues, please share it here to help others *This comment was generated automatically by a bot.* Please react with a 👍 if this comment was helpful, or a 👎 if it was not.
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Reference: github-starred/open-webui#34941
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