FastAPI can fail to record App Service URL

[jeremydvoss]

• Package Name: azure-monitor-opentelemetry(-exporter)
• Package Version:
• Operating System: Linux App Service
• Python Version: 3.11

Describe the bug
FastAPI reports IP instead of URL in Application Insights table.

To Reproduce
Steps to reproduce the behavior:

1. Deploy Fastapi App Service
2. Query
3. Check App Insights

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Additional context
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