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The operator should be "+" (#732) 

* The operator should be "+"

The operator should be "+", because in the example the HTTP method is "/add"

* typo fix: it should be "response" body
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reference/api/service_invocation_api.md
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@ -81,14 +81,14 @@ app.post('/add', (req, res) => {
let args = req.body;
const [operandOne, operandTwo] = [Number(args['arg1']), Number(args['arg2'])];
let result = operandOne / operandTwo;
let result = operandOne + operandTwo;
res.send(result.toString());
});
app.listen(port, () => console.log(`Listening on port ${port}!`));
```
> The response from the remote endpoint will be returned in the request body.
> The response from the remote endpoint will be returned in the response body.
In case when your service listens on a more nested path (e.g. `/api/v1/add`), Dapr implements a full reverse proxy so you can append all the necessary path fragments to your request URL like this: