webclient GET request failed

发布于 2022-03-30 11:27:03 浏览：912 订阅该版

```c
#include <rtthread.h>
#include <webclient.h>

#define GET_HEADER_BUFSZ               1024
#define GET_RESP_BUFSZ                 1024

#define GET_LOCAL_URI                  "http://www.rt-thread.com/service/rt-thread.txt"

/* send HTTP GET request by common request interface, it used to receive longer data */
static int webclient_get_comm(const char *uri)
{
    struct webclient_session* session = RT_NULL;
    unsigned char *buffer = RT_NULL;
    int index, ret = 0;
    int bytes_read, resp_status;
    int content_length = -1;

buffer = (unsigned char *) web_malloc(GET_RESP_BUFSZ);
    if (buffer == RT_NULL)
    {
        rt_kprintf("no memory for receive buffer.\n");
        ret = -RT_ENOMEM;
        goto __exit;

}

/* create webclient session and set header response size */
    session = webclient_session_create(GET_HEADER_BUFSZ);
    if (session == RT_NULL)
    {
        ret = -RT_ENOMEM;
        goto __exit;
    }

/* send GET request by default header */
    if ((resp_status = webclient_get(session, uri)) != 200)
    {
        rt_kprintf("webclient GET request failed, response(%d) error.\n", resp_status);
        ret = -RT_ERROR;
        goto __exit;
    }

rt_kprintf("webclient get response data: \n");

content_length = webclient_content_length_get(session);
    if (content_length < 0)
    {
        rt_kprintf("webclient GET request type is chunked.\n");
        do
        {
            bytes_read = webclient_read(session, buffer, GET_RESP_BUFSZ);
            if (bytes_read <= 0)
            {
                break;
            }

for (index = 0; index < bytes_read; index++)
            {
                rt_kprintf("%c", buffer[index]);
            }
        } while (1);

rt_kprintf("\n");
    }
    else
    {
        int content_pos = 0;

do
        {
            bytes_read = webclient_read(session, buffer, 
                    content_length - content_pos > GET_RESP_BUFSZ ?
                            GET_RESP_BUFSZ : content_length - content_pos);
            if (bytes_read <= 0)
            {
                break;
            }

for (index = 0; index < bytes_read; index++)
            {
                rt_kprintf("%c", buffer[index]);
            }

content_pos += bytes_read;
        } while (content_pos < content_length);

rt_kprintf("\n");
    }

__exit:
    if (session)
    {
        webclient_close(session);
    }

if (buffer)
    {
        web_free(buffer);
    }

return ret;
}

int webclient_get_test()
{
    char *uri = RT_NULL;
    uri = web_strdup(GET_LOCAL_URI);
    if(uri == RT_NULL)
    {
        rt_kprintf("no memory for create get request uri buffer.\n");
        return -RT_ENOMEM;
    }
    webclient_get_comm(uri);
}
```

硬件为stm32h系列的，想用webclient，通过url，来下载一个安装包(https)，想先试跑一下官方例程，后面下载安装包只是url变一下，4g网络是好的(我用自己的笔记本电脑连这个wifi直接用postman get这个Url是能打开的的)，
以上差不多照搬官网源码教程，然后报错。
打印：
     host address: www.rt-thread.com , port: 80
     [sal_getaddrinfo] SAL_NETDEV_NETDBOPS_VALID
      getaddrinfo err: 202 'www.rt-thread.com'
      connect failed, resolve address error(-1).
      webclient GET request failed, response(-1) error.