libevent HTTP client 的实现

 　　　　　　 my_conn_ = evhttp_connection_base_new(ev_base_,ev_dns_,host,port);
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 50         struct evhttp_request *http_req;
 51         http_req = evhttp_request_new(rspCallback,(void *)arg);                        //rspCallback接收消息
 52         struct evkeyvalq *head = evhttp_request_get_output_headers(http_req);
 53
 55         evhttp_add_header(head,"User-Agent","My Device");
 56         evhttp_add_header(head,"Connection","Keep-Alive");
 57         char buf[16];
 58         snprintf(buf,15,"%d",req.terminaltype);
 59         evhttp_add_header(head,"terminaltype",buf);
 60         evhttp_add_header(head,"versioninfo",req.version_info.c_str());
 61         evhttp_add_header(head,"osinfo",req.osinfo.c_str());
 62         evhttp_add_header(head,"despasswd",req.despasswd.c_str());
 63
 66         evhttp_add_header(head,"Host",host);
 67
 68         int ret = evhttp_make_request(my_conn_,http_req,EVHTTP_REQ_PUT,"/myurl");
 69         evhttp_uri_free(uri);