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document how to pass payload from file, fixes #279 #281

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document how to pass payload from file, fixes #279 #281

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6 changes: 6 additions & 0 deletions README.md
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Expand Up @@ -146,6 +146,12 @@ grpcurl -d @ grpc.server.com:443 my.custom.server.Service/Method <<EOM
EOM
```

Sometimes it might be necessary to read the payload from a file. This worked for some users:
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"This worked for some users" -- this wording feels really non-committal. We can make it authoritative.

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Sometimes it might be necessary to read the payload from a file. This worked for some users:
To use a file as the request payload, redirect the file to `grpcurl`'s stdin:


```shell
grpcurl -d "$(cat my.json)" grpc.server.com:443 my.custom.server.Service/Method
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I think the more straight-forward way, that doesn't require this particular feature in your shell, is to use the @ value as the input, very much like the example above.

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grpcurl -d "$(cat my.json)" grpc.server.com:443 my.custom.server.Service/Method
grpcurl -d @ grpc.server.com:443 my.custom.server.Service/Method < my.json

```

### Listing Services
To list all services exposed by a server, use the "list" verb. When using `.proto` source
or protoset files instead of server reflection, this lists all services defined in the
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