[Bug]: Creating an MCP OAUTH2 server fails if using API.

[popagruia]

🐞 Bug Summary

Briefly describe the issue or unexpected behavior.
If I try to use the API to create an OAUTH2 MCP server the creation will fail. Normally I should be able to use the UI to authorise but creation should not fail.

🧩 Affected Component

Select the area of the project impacted:

• mcpgateway - API
• mcpgateway - UI (admin panel)
• mcpgateway.wrapper - stdio wrapper
• Federation or Transports
• CLI, Makefiles, or shell scripts
• Container setup (Docker/Podman/Compose)
• Other (explain below)

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🔁 Steps to Reproduce

1. curl -s -X POST -H "Authorization: Bearer $MCPGATEWAY_BEARER_TOKEN"
   -H "Content-Type: application/json"
   -d '{
   "name": "github_com",
   "url": "https://api.githubcopilot.com/mcp/",
   "description": "A new MCP server added with OAuth2 authentication",
   "auth_type": "oauth",
   "auth_value": {
   "client_id": "'$CLIENT_ID'",
   "client_secret": "'$CLIENT_SECRET'",
   "token_url": "https://github.com/login/oauth/access_token",
   "redirect_url": "http://localhost:4444/oauth/callback"
   },
   "tags": ["system:github.com"],
   "passthrough_headers": ["X-Vault-Tokens"]
   }'
   http://localhost:4444/gateways

2. 2025-09-22 11:56:40,182 - mcpgateway.services.gateway_service - ERROR - GatewayConnectionError in group: (GatewayConnectionError('Failed to initialize gateway at https://api.githubcopilot.com/mcp/'),)
   2025-09-22 11:56:40,186 - uvicorn.access - INFO - 127.0.0.1:63479 - "POST /gateways HTTP/1.1" 503

3. ...

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🤔 Expected Behavior

What should have happened instead?

Creation succeeded and I can Authorise in UI.

📓 Logs / Error Output

Paste any relevant stack traces or logs here.
⚠️ Do not paste secrets, credentials, or tokens.

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🧠 Environment Info

You can retrieve most of this from the /version endpoint.

Key	Value
Version or commit	`0.0.7
Runtime	Python 3.11, Gunicorn
Platform / OS	macOS
Container	local

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🧩 Additional Context (optional)

Add any configuration details, flags, or related issues.