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added comment about setting cacheable flag.

Makarand Dharmapurikar 9 years ago
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      doc/interop-test-descriptions.md

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doc/interop-test-descriptions.md

@@ -70,6 +70,10 @@ cache matches left over from previous tests.
 Note that client adds a `x-user-ip` header with value `1.2.3.4` to the request.
 Note that client adds a `x-user-ip` header with value `1.2.3.4` to the request.
 This is done since some proxys such as GFE will not cache requests from
 This is done since some proxys such as GFE will not cache requests from
 localhost.
 localhost.
+Note also that the client request needs to marked as cacheable. For now this is
+achieved by setting the cacheable flag in the request context to 'true'.Longer
+term this will be automatically set via method options specified in the proto
+file.
 
 
 Server features:
 Server features:
 * [CacheableUnaryCall][]
 * [CacheableUnaryCall][]