[WIP] HTTP uploads with curl fail silently or with a 400

[Copilot]

• Explore repository structure and understand the codebase
• Set up test environment and fix warnings.deprecated issue in websockets.py
• Run existing tests to understand current behavior
• Reproduce the curl upload issues described in the problem statement
• Identify root causes of the upload failures:
  • Missing Content-Length header causes silent failures/timeouts
  • Missing Content-Type header causes 400 "Invalid file metadata"
  • Zero/invalid Content-Length causes 400 "Invalid file metadata"
  • Short filenames cause 400 "Invalid file metadata"
• Fix FileMetadata.get_from_http_headers() to handle missing/invalid headers gracefully
• Update validation to be more permissive for legitimate curl use cases
• Add defensive defaults for missing headers
• Test fix with curl command simulation
• Run all tests to ensure no regressions

The issue is in the FileMetadata.get_from_http_headers() method which doesn't handle missing or invalid HTTP headers gracefully, causing legitimate curl uploads to fail.

Fixes #10.

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