Onvif.GetCapability发出的包有问题

wireshark抓包，电脑发出的包protocol是IP？，本该是HTTP/XML的嘛，它的xml包也正常。
代码贴在一楼。
求教，怎样修改才能发出 HTTP/XML包呢？

int UserGetCapabilities( )

{

int retval = 0;

struct soap *soap = NULL;

struct tds_GetCapabilities capa_req;

struct tds_GetCapabilitiesResponse capa_resp;

enum tt__CapabilityCategory temp_category;
struct SOAP_ENV__Header header;

soap = soap_new(); //初始化soap
if(soap==NULL)
printf("Soap初始化失败！");
soap_set_namespaces(soap, namespaces); //设置命名空间
soap_default_SOAP_ENV__Header(soap, &header);

soap->header = &header;

char *soap_endpoint = (char *)malloc(256);

memset(soap_endpoint, '\0', 256);

sprintf(soap_endpoint, "http://%s:%d/onvif/device_service", "10.0.10.207", 80);

capa_req.Category = (enum tt__CapabilityCategory *)soap_malloc(soap, sizeof(int));

capa_req.__sizeCategory = 1;

temp_category = tt__CapabilityCategory__Media;

capa_req.Category = &temp_category;
//此句也可以不要，因为在接口soap_call___tds__GetCapabilities中判断了，如果此值为NULL,则会给它赋值

const char *soap_action = "http://www.onvif.org/ver10/device/wsdl/GetCapabilities";

soap_wsse_add_UsernameTokenDigest(soap,"user", ONVIF_USER, ONVIF_PASSWORD);  
do  
{  
    soap_call___tds__GetCapabilities(soap, soap_endpoint, soap_action, &capa_req, &capa_resp);  
    if (soap->error)  
    {  
        printf(" soap error: %d, %s, %s\n", soap->error, *soap_faultcode(soap), *soap_faultstring(soap));  
        retval = soap->error;  
        break;  
    }  
    else   //获取参数成功  
    {           
        printf("Get capabilities success !\n");  
        printf("\n%s\n", capa_resp.Capabilities->Media->XAddr);
    }  
}while(0);  
free(soap_endpoint);  
soap_endpoint = NULL;  
soap_destroy(soap);  
return retval;  

}

这是代码，没有C币了...
希望了解的能帮帮忙！！