Step (2) sets the HTTP request headers and prepares the payload to be sent in step (3) over the stream to the service.
步骤(2)设置HTTP请求头，并准备在步骤(3)中通过流发送的负载。
Step (2) sets the HTTP request headers and prepares the payload to be sent in step (3) over the stream to the service.
步骤(2)设置HTTP请求头，并准备在步骤(3)中通过流发送的负载。
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