[cabe] update README.md re: how to query prod using grcpurl
Change-Id: Iffdf86f5bcded67bfbc2e31972c8c5cd892ed8c5
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/703503
Commit-Queue: Sean McCullough <seanmccullough@google.com>
Reviewed-by: Yuan Huang <yuanhuang@google.com>
diff --git a/cabe/README.md b/cabe/README.md
index 13aad79..39bb732 100644
--- a/cabe/README.md
+++ b/cabe/README.md
@@ -19,6 +19,23 @@
- `//cabe/go/proto`
- protobuf message and service definitions
+## Querying the production cabe.skia.org service with `grpcurl`
+
+To make a `GetAnalysis` request for a specific pinpoint job, you can use the
+[grpcurl](https://github.com/fullstorydev/grpcurl) command line utility.
+
+For this command to work, you should also have `gcloud` installed, and run
+`gcloud auth login` so you're logged in using an authorized account.
+
+```
+grpcurl -H "Authorization: Bearer $(gcloud auth print-access-token)" \
+ -d '{"pinpoint_job_id":"<PINPOINT JOB ID>"}' \
+ cabe.skia.org:443 cabe.proto.Analysis/GetAnalysis
+```
+
+If successful, this command will write a textproto encoding of the
+`cabe.proto.GetAnalysisResponse` from the server to stdout.
+
## Running locally
To start the server, in one terminal run:
