AgentConsulClient.agentServiceRegister use wrong content-type

[FunnyYish]

AgentConsulClient.agentServiceRegister send a http request with json body，but the content-type is text/plain; charset=UTF-8 rather than application/json

[TsingIn]

Thank you for your question.
From the code, it does seem that the program uses the Httpclient default MimeType, which we can change to application / json.
But I have a better idea, why can't we take this opportunity to change Httpclient to Retrofit?