前提摘要

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给HTTP完整的一生

一个完整的HTTP请求至少需要以下几个部分
…
一、请求行.
二、请求头部.
三、空行.
四、请求体.
…

请求行

结构 > 请求方式 + 请求URL + HTTP协议版本

栗子

GET www.google.com HTTP/1.1 
POST /interface/doc HTTP/1.0
#get或post请求方式，url使用绝对地址或相对地址
#HTTP1.1相比HTTP1.0，引入了持久连接，需要更多的系统资源，嵌入式不建议使用
#请求方式还有DELETE、PUT、HEAD、OPTIONS等

请求头部

Wireshark抓包分析

Host: www.example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml
Accept-Language: zh-CN
Connection: keep-alive

空行

\r\n\r\n

第一个 \r\n 是上一行内容需要换行，第二个 \r\n 是为了空出一行

请求体

{
  "name": "张三",
  "age": 26
}

代码实现

为了一目了然，代码未拆分函数部分！

	// 创建套接字
	int sock = socket(AF_INET, SOCK_STREAM, 0);
	if(sock < 0){
		return -1;
	}
	
	int millsec = 10000;
	struct timeval tv;
	tv.tv_sec = 0;	// 超时时间设置为5秒
	tv.tv_usec = millsec*1000;
	
	if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (const void*)&tv, sizeof(tv)) < 0) {
		
		printf("setsockopt failed\n");
	}
	if (setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (const char*)&tv, sizeof(tv)) < 0) {
		printf("setsockopt failed\r\n");
	}
	
	struct sockaddr_in server_addr;
    struct hostent *server;
	
    server = gethostbyname("www.baidu.com");
	if(server == NULL) {
		printf("[ERROR] Get host ip failed\n");
		return -1;
    }
    
    // 设置服务器地址
	memset(&server_addr, 0, sizeof(server_addr));
	server_addr.sin_family = AF_INET;
    memcpy(&server_addr.sin_addr.s_addr,server->h_addr,4);
	server_addr.sin_port = htons(80);
	
	int ret = 0;
	if (0 != 
		(ret = connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr_in)))) {
		printf("sock_connect fail:%d\n", ret);
		return ret;
	}

	uint8_t http_uri[1024] = {0};
	sprintf(http_uri, "POST %s HTTP/1.0\r\nHost: %s\r\nAccept-Encoding: ''\r\nContent-Type: image/jpeg\r\nContent-Length: %d\r\n"
						"deviceId: %s\r\ndeviceToken: %s\r\naction: start\r\nsid: %d\r\nstream: 1\r\n\r\n", ……);
	
	ret = send(sock, (void*)http_url, strlen(http_uri), 0); // send header
	if(ret <= 0){
		if (sock_recv_timeout(sock)) {
			printf("sock_send\r\n");			
			return 0;
		}
		printf("sock_send failed ret = %d\r\n",ret);
		return -2;
	}
	
	uint8_t body_str[100] = {0};
	os_memcpy(body_str, "123", strlen("123"));
	ret = send(sock, (void*)body_str, strlen(body_str), 0);

	uint8_t rec_str[512] = {0};
	ret = recv(ai_sock, (void*)rec_str, len, 0); 
	if(ret <= 0){
		printf("brush_http_recv failed:%d\r\n", ret);
		return -1;
	}
	
	if(strncmp(rec_str, "HTTP/", strlen("HTTP/")) != 0){
		printf("Not found HTTP\r\n");
		return -2;
	}
	
	uint8_t* p_ptr;
	p_ptr = rec_str+strlen("HTTP/1.1");
	if(atoi(p_ptr) != 200){
		printf("Bad HTTP Code:%d\r\n", atoi(p_ptr));
		return -2;
	}
	
	if((p_ptr = strstr(rec_str, "\r\n\r\n")) == NULL){
		printf("Not found http header\r\n");
		return -2;
	}
	p_ptr += strlen("\r\n\r\n");
	
	uint8_t* p_cnt_len;
	p_cnt_len = strstr(rec_str, "Content-Length:");
	if(p_cnt_len){
		p_cnt_len += strlen("Content-Length:");
		cnt_len = atoi(p_cnt_len);	
		ret -= (p_ptr-rec_str);

		if(cnt_len != ret){
			printf("Content-Length mismatch:%d/%d\r\n", cnt_len, ret);	
			brush_error = BLE_wifi_state_photo_upload_error;	
			goto HTTP_FAILED;
		}
	}

先写到这，静待下一章！