icexin opened a new issue, #3109:
URL: https://github.com/apache/brpc/issues/3109
**Describe the bug**
When using a GRPC client to call a brpc server with redis protocol enabled,
the client will failed with `code = Unavailable desc = connection closed before
server preface received`.
Introduced by #3024 , the Redis protocol check is too loose, and it parses
the GRPC protocol as the Redis protocol.
**To Reproduce**
This is the code to reproduce the the issue.
``` c++
#include <brpc/server.h>
class RedisService : public brpc::RedisService {
};
int main(int argc, char* argv[]) {
google::ParseCommandLineFlags(&argc, &argv, true);
brpc::Server server;
brpc::ServerOptions options;
RedisService redis_service;
options.redis_service = &redis_service;
if (server.Start(7447, &options) != 0) {
LOG(ERROR) << "Failed to start dummy server";
return 1;
}
server.RunUntilAskedToQuit();
return 0;
}
```
**Expected behavior**
The GRPC client failed with `code = Unimplemented desc =
[10.234.44.157:4003][E1002]Fail to find method on /service.method"
**Versions**
OS: ubuntu 20.04 kernel: 5.15.0
Compiler: clang-12
brpc: 1.14.1
protobuf: 27.3
**Additional context/screenshots**
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