libevent HTTP client 的实现

 　　　　　　 my_conn_ = evhttp_connection_base_new(ev_base_,ev_dns_,host,port);                                                                                  
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 48                                                                                                
 49                                                                                                                                                               
 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);