增加支持grpc-web-text, 关闭http_compression #4805
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2.如果是通过envoy 转发, 判断请求头 accept 是application/grpc-web-text 和 x-grpc-web是 1,和上面的情况,检测server的settings. 如果http_compression(默认)开启,抛出异常,提示必须关闭 http_compression,(即不要开启gzip)http_compression = false