document how to pass payload from file, fixes #279
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@ -146,6 +146,12 @@ grpcurl -d @ grpc.server.com:443 my.custom.server.Service/Method <<EOM
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EOM
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```
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Sometimes it might be necessary to read the payload from a file. This worked for some users:
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```shell
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grpcurl -d "$(cat my.json)" grpc.server.com:443 my.custom.server.Service/Method
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```
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### Listing Services
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To list all services exposed by a server, use the "list" verb. When using `.proto` source
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or protoset files instead of server reflection, this lists all services defined in the
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