HTTP Status 417 - Expectation Failed

POST /api/uploads HTTP/1.1
Host: api.example.com
Content-Type: video/mp4
Content-Length: 524288000
Expect: 100-continue

HTTP/1.1 417 Expectation Failed
Content-Type: application/json
WWW-Authenticate: Bearer realm="api"

{
  "error": "authentication_required",
  "message": "Upload requires authentication",
  "details": "Include Authorization header with valid Bearer token"
}

PUT /api/documents/report.pdf HTTP/1.1
Host: storage.example.com
Content-Type: application/pdf
Content-Length: 104857600
Expect: 100-continue
Authorization: Bearer token123

HTTP/1.1 417 Expectation Failed
Content-Type: application/json

{
  "error": "quota_exceeded",
  "message": "Upload would exceed storage quota",
  "quota_remaining": 52428800,
  "requested_size": 104857600
}

POST /api/images HTTP/1.1
Host: cdn.example.com
Content-Type: image/webp
Content-Length: 2097152
Expect: 100-continue

HTTP/1.1 417 Expectation Failed
Content-Type: application/json

{
  "error": "unsupported_content_type",
  "message": "Content-Type image/webp not supported",
  "supported_types": ["image/jpeg", "image/png", "image/gif"]
}