# First, get the object and note its ETag
curl -I "http://localhost:8333/mybucket/myfile.txt"
# Response: ETag: "d41d8cd98f00b204e9800998ecf8427e"

# Conditional GET - only download if object changed
curl -H "If-None-Match: \"d41d8cd98f00b204e9800998ecf8427e\"" \
  "http://localhost:8333/mybucket/myfile.txt"

# Safe update - only modify if object hasn't changed
curl -X PUT -H "If-Match: \"d41d8cd98f00b204e9800998ecf8427e\"" \
  -H "Content-Type: text/plain" \
  --data "Updated content" \
  "http://localhost:8333/mybucket/myfile.txt"

# Prevent overwrites - only create if object doesn't exist
curl -X PUT -H "If-None-Match: *" \
  -H "Content-Type: text/plain" \
  --data "New file content" \
  "http://localhost:8333/mybucket/newfile.txt"

# Only download if modified after specific date
curl -H "If-Modified-Since: Wed, 15 Jan 2024 10:00:00 GMT" \
  "http://localhost:8333/mybucket/log-file.txt"

# Update only if not modified since last read
curl -X PUT \
  -H "If-Unmodified-Since: Wed, 15 Jan 2024 10:00:00 GMT" \
  -H "Content-Type: text/plain" \
  --data "Updated content" \
  "http://localhost:8333/mybucket/document.txt"

# Copy only if source object hasn't changed
curl -X PUT \
  -H "x-amz-copy-source: /source-bucket/source-file.txt" \
  -H "x-amz-copy-source-if-match: \"source-etag\"" \
  "http://localhost:8333/dest-bucket/dest-file.txt"