Parsing a Response

After receiving and interpreting a request message, the server returns an HTTP response message.

A response consists of three parts: status line, response header, and response body.

The format of the status line is as follows:

HTTP-Version Status-Code Reason-Phrase CRLF

HTTP-Version: version of the HTTP protocol used by the server.
Status-Code: status code in the response returned by the server.
A status code consists of three digits. The first digit defines the class of response. There are five values for the first digit:
- 1xx: informational. The request was received, continuing process.
- 2xx: successful. The request was successfully received, understood, and accepted.
- 3xx: redirection. Further action needs to be taken to complete the request.
- 4xx: client error. The request contains bad syntax or cannot be fulfilled.
- 5xx: server error. The server failed to fulfill an apparently valid request.
Reason-Phrase: text description of a status code.

Table 1 describes the headers in most responses.

The response body is in JSON format.

Parent topic: Using APIs

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