Conditional requests

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• Prefer ETag to Last-Modified or support both.

• 10.4. How to Implement Conditional PUT Requests in Servers

• 10.5 How to Implement Conditional DELETE Requests in Servers

• 10.7. How to Submit Conditional PUT and DELETE Requests from Clients

• 10.2. How to Implement Conditional GET Requests in Servers

• 10.3. How to Submit Conditional GET and HEAD Requests from Clients

• 10.8. How to Make POST Requests Conditional

• 10.9. How to Generate One-Time URIs