Shulou(Shulou.com)06/02 Report--

experience

1) cooperate with Postman to generate sample code quickly.

2) curl_global_init initialization

If curl_global_init is not called to initialize the curl global variable when the curl library function is called, the initialization call will be made in the curl_easy_init function.

3) when requesting data, you should carry the format of the return message, otherwise you will not be able to return valid data

Struct curl_slist * pCurlHeadList = NULL

PCurlHeadList = curl_slist_append (pCurlHeadList, "content-type: application/json")

Curl_easy_setopt (pCurlHandle, CURLOPT_HTTPHEADER, pCurlHeadList)

Currently, when interfacing with the backend of an ASP web page, you must specify the format of the transmitted text

4) the delay of libcurl transmission reaches 1 second

When the length of POST data is greater than 1024 bytes, libcurl will not send the POST request directly, but will execute it in two steps:

Send a request with an Expect: 100-continue field in the header to ask server if it is willing to receive data

When a reply from the 100-continue returned from server is received, the POST request is actually initiated and the data is sent to server.

Solution

Struct curl_slist * pCurlList = NULL

PCurlList = curl_slist_append (pCurlList, "expect:")

Curl_easy_setopt (pCurlHandle, CURLOPT_HTTPHEADER, pCurlList)

5) return error code record analysis

CURLE_COULDNT_CONNECT (7)

The host or agent for connect () failed.

CURLE_GOT_NOTHING (52)

In the case of a successful server connection, but no return from the server, and what is obtained, it is considered an error

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