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当我尝试使用没有 ssl 的 grpc-web 时，它工作正常。我的方法是这样的

final channel = GrpcWebClientChannel.xhr(Uri.parse('http://192.168.43.130:8080'));
final client = GreeterClient(channel);

但是当我尝试用 ssl 实现它时，它会抛出一个错误。错误是这样的。

Error: gRPC Error (code: 2, codeName: UNKNOWN, message: HTTP request completed without a status (potential CORS issue), details: null, rawResponse: , trailers:
{})
    at Object.throw_ [as throw] (http://localhost:38485/dart_sdk.js:5063:11)
    at Object.validateHttpStatusAndContentType (http://localhost:38485/packages/grpc/src/shared/status.dart.lib.js:449:17)
    at xhr_transport.XhrTransportStream.new.[_validateResponseState] (http://localhost:38485/packages/grpc/src/client/transport/xhr_transport.dart.lib.js:88:16)
    at xhr_transport.XhrTransportStream.new.[_onRequestDone] (http://localhost:38485/packages/grpc/src/client/transport/xhr_transport.dart.lib.js:111:67)
    at http://localhost:38485/packages/grpc/src/client/transport/xhr_transport.dart.lib.js:157:31
    at Object._checkAndCall (http://localhost:38485/dart_sdk.js:5270:16)
    at Object.dcall (http://localhost:38485/dart_sdk.js:5275:17)
    at XMLHttpRequest.<anonymous> (http://localhost:38485/dart_sdk.js:108843:100)

这一次，我的做法是

final channel = GrpcWebClientChannel.xhr(Uri.parse('https://192.168.43.130:8080'));
final client = GreeterClient(channel);

使用 ssl ，我在envoy.yaml文件中添加了以下行。

    transport_socket:
      name: envoy.transport_sockets.tls
      typed_config:
        "@type": type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.UpstreamTlsContext
        common_tls_context:
          alpn_protocols: h2
          validation_context:
            trusted_ca:
              filename: cert.pem
          tls_certificates:
            - certificate_chain:
                filename: cert.pem
              private_key:
                filename: key.pem

笔记：- I am using self signed certificate using mkcert.

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