HTTPProtocol

Metadata-dependent Behavior

The knownMetadata argument to HTTPProtocol.getProtocolOutput() can affect the behavior of the protocol. The following metadata keys are detected by HTTPProtocol and utilized in performing the request:

• cachedLastModified: If this key is present in knownMetadata, the protocol will use the metadata value as the date for the If-Modified-Since header field of the HTTP request. If the key is not present, the If-Modified-Since field won't be added to the request header.

• cachedEtag: If this key is present in knownMetadata, the protocol will use the metadata value as the ETag for the If-None-Match header field of the HTTP request. If the key is not present, the If-None-Match field won't be added to the request header.