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Client throws base64 encoding error on RPC call

See original GitHub issue

Given the following sample web page

<html>
    <meta charset="utf-8"/>
    <script src="compiled.js"></script>
    <script>

        var client = new proto.API.ServiceClient('127.0.0.1:50051');

        var query = new proto.API.Query();
        query.setMessagesList(["testing", "1", "2", "3"]);

        client.get(query, {}, function(error, response) {
            if (error) {
                console.log(error);
            } else {
                console.log(reponse.getResponse());
            }
        });
    </script>
</html>

A JavaScript error is thrown at client.get with the following stacktrace.

Error: Unknown base64 encoding at char: <
compiled.js:429:210
c
http://localhost:3000/compiled.js:429:210
goog.crypt.base64.decodeStringInternal_
http://localhost:3000/compiled.js:429:312
goog.crypt.base64.decodeStringToUint8Array
http://localhost:3000/compiled.js:428:277
module$contents$grpc$web$GrpcWebClientReadableStream_GrpcWebClientReadableStream/<
http://localhost:3000/compiled.js:432:237
goog.events.EventTarget.prototype.fireListeners
http://localhost:3000/compiled.js:279:296
goog.events.EventTarget.dispatchEventInternal_
http://localhost:3000/compiled.js:281:475
goog.events.EventTarget.prototype.dispatchEvent
http://localhost:3000/compiled.js:276:274
goog.net.XhrIo.prototype.onReadyStateChangeHelper_
http://localhost:3000/compiled.js:401:485
goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_
http://localhost:3000/compiled.js:400:491
goog.net.XhrIo.prototype.onReadyStateChange_
http://localhost:3000/compiled.js:400:387
<anonymous> self-hosted:975:17

I’m a little puzzled by the method signature of client.get. Are there any docs which point me in the direction of what the empty object in the second parameter is doing?