问题
I want to use Google Cloud Speech API in one of my app. I want to use Cloud Speech Streaming gRPC. I am using following sample as an example. Cloud Speech Streaming gRPC Objective-C Sample
I installed this demo application and it is working fine but when I installed required Google Speech libs in my application and tried to run my application, my application crashed with above mentioned error.
回答1:
I removed Firebase/Core from pod file and also removed it's headers in the files where I am using solved my problem. If you face this problem just update your pod files with latest version of Firebase.
来源：https://stackoverflow.com/questions/44871015/error-posting-to-clearcut-null-with-status-code-400-in-google-cloud-speech