libcurl使用笔记

来源：互联网发布：淘宝漏洞,免费买衣服编辑：程序博客网时间：2024/05/22 06:28

curl:

GET: curl -vG -d “test=string” http://127.0.0.1

不加-G是POST

直接curl 127.0.0.1是GET

直接curl -v http://127.0.0.1/xxx?test=string&test2=string2 是GET，但是无法发送&test2=string2

POST: curl -vX POST -d “test=string” http://127.0.0.1

libcurl:

libcurl returns CURLE_OK when the transfer went fine. Getting a 404 from a HTTP server is considered a fine transfer.

The response code is only going to be set if curl_easy_perform() returns CURLE_OK so you should check that first to make sure curl actually performed the request successfully.

POST请求到没有server的地址拿不到http code。只有GET能拿到。

用GET调curl_easy_setopt(curl_handle, CURLOPT_URL, url);的时候，url中必须是完整的请求http://127.0.0.1/xxx?test=string&test2=string2。

用POST时url里只需要是http://127.0.0.1/xxx? ，然后再调curl_easy_setopt(curl_handle, CURLOPT_COPYPOSTFIELDS, request);

OPT:

libcurl默认是用GET

/* * Initialize the UserDefined fields within a SessionHandle. * This may be safely called on a new or existing SessionHandle. */CURLcode Curl_init_userdefined(struct UserDefined *set){    set->httpreq = HTTPREQ_GET; /* Default HTTP request */}

curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1);相当于-v

    case CURLOPT_VERBOSE:    /*     * Verbose means infof() calls that give a lot of information about     * the connection and transfer procedures as well as internal choices.     */    data->set.verbose = (0 != va_arg(param, long))?TRUE:FALSE;    break;

curl_easy_setopt(curl_handle, CURLOPT_POST, 1);1为用POST，0为用GET

    case CURLOPT_POST:    /* Does this option serve a purpose anymore? Yes it does, when       CURLOPT_POSTFIELDS isn't used and the POST data is read off the       callback! */    if(va_arg(param, long)) {      data->set.httpreq = HTTPREQ_POST;      data->set.opt_no_body = FALSE; /* this is implied */    }    else      data->set.httpreq = HTTPREQ_GET;    break;

curl_easy_setopt(curl_handle, CURLOPT_COPYPOSTFIELDS, 1);也是用POST

    case CURLOPT_COPYPOSTFIELDS:    /*     * A string with POST data. Makes curl HTTP POST. Even if it is NULL.     * If needed, CURLOPT_POSTFIELDSIZE must have been set prior to     *  CURLOPT_COPYPOSTFIELDS and not altered later.     */    data->set.httpreq = HTTPREQ_POST;    break;

curl_easy_setopt(curl_handle, CURLOPT_HTTPGET, 1);1为用GET，0啥也不干

    case CURLOPT_HTTPGET:    /*     * Set to force us do HTTP GET     */    if(va_arg(param, long)) {      data->set.httpreq = HTTPREQ_GET;      data->set.upload = FALSE; /* switch off upload */      data->set.opt_no_body = FALSE; /* this is implied */    }    break;

0 0