The HTTP response structure

mirrors that of the HTTP request. It contains:

  • A response line

  • A header

  • The body

HTTP Status Codes

一個成功 request to server 會產生一個 response, which is the message the server sends back to you, the client.

  • 有時候會看到錯誤代碼 502 ，這個代碼叫做HTTP Status Codes

  • 開頭從1xx,2xx,3xx,4xx,5xx，這個規定是IETF

  • 各個代碼的簡介

  • 1xx: You won't see these a lot. The server is saying, "Got it! I'm working on your request."

  • 2xx: These mean "okay!" The server sends these when it's successfully responding to your request.

  • 3xx: These mean "I can do what you want, but I have to do something else first." You might see this if a website has changed addresses and you're using the old one; the server might have to reroute the request before it can get you the resource you asked for.

  • 4xx: These mean you probably made a mistake. The most famous is "404," meaning "file not found": you asked for a resource or web page that doesn't exist.

  • 5xx: These mean the server goofed up and can't successfully respond to your request.

  • Full List :https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

Anatomy of a Response

The HTTP response structure mirrors that of the HTTP request. It contains:

  1. A response line, which includes the three-digit HTTP status code;

  2. A header, which includes further information about the server and its response;

  3. The body, which contains the text of the response.

XML是什麼？Parsing XML

  • XML (which stands for ExtensibleMarkupLanguage)

  • 很像 HTML ，使用標籤語言—it uses tags between angle brackets

  • 差別在自創：XML allows you to use tags that you make up, rather than tags that the W3C decided on

For instance, you could create an API that returns information about a pet：

<pet>
<name>Jeffrey</name>
<species>Giraffe</species>
</pet>
  • As long as you document the structure of your API's response, other people can use your API to get information about <pet>s.

JSON 是什麼？Parsing JSON

  • JSON (which stands forJavaScriptObjectNotation) is an alternative to XML

  • Data format 像 JavaScript objects

  • 比 XML 簡潔(succinct) ，以下面這個<pet> 為例

{
"pets": {
"name": "Jeffrey",
"species": "Giraffe"
}
}

XML or JSON?

要怎麼知道 API will reply with XML or JSON? 就看 API 文件吧!!

results matching ""

    No results matching ""