SMS-Sender | 短信发送平台-任务调度SpringSecurityNetty多平台接入CMPP | Websocket library

Reason for getting below error is the content type is not properly overridden.

{message:"Entity body is not json compatible since the received content-type is : text/plain", cause:null}

setPayload method infers the type of payload by the method parameter and set respective default parameter. In this instance, payload is string type, so content-type is set as text/plain. addHeader method doesn't replace existing header values as it just adds another entry for particular existing header name.

Since priority is given to the first enty content-type is still text/plain. Solution is to use setHeader which replaces the existing header value.