C：發送HTTP GET請求在linux

Question

我努力讓自己在80端口的連接和本地主機發送一個簡單的HTTP GET請求，同時我跑Wireshark的，看看標題。這是我的代碼：

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <unistd.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <pthread.h> 
#include <netinet/in.h> 
#include <errno.h> 
#include <string.h> 


int main(int argc, char *argv[]) 
{ 

    int yes = 1; 
char buffer[1024]; 
int newsockfd, portno, recv_length, sockfd; 
socklen_t clilen; 
struct sockaddr_in serv_addr, cli_addr; 
ssize_t number; 
if (sockfd < 0) 
    error("ERROR opening socket"); 
bzero((char *) &serv_addr, sizeof(serv_addr)); 


    sockfd = socket(AF_INET, SOCK_STREAM, 0); 

serv_addr.sin_family = AF_INET; 
serv_addr.sin_addr.s_addr = 0; 
serv_addr.sin_port = htons(80); 




connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)); 


if(send(sockfd, 


"GET/HTTP/1.1\r\n 
Host: localhost\r\n 
Connection: Keep-alive\r\n 
Cache-Control: max-age=0\r\n 
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,;q=0.8\r\n 
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.91 Safari/537.36\r\n 
Accept-Encoding: gzip, deflate, sdch\r\n 
Accept-Language: en-US,en;q=0.8\r\n\r\n", 

strlen("GET/HTTP/1.1\r\n 
Host: localhost\r\n 
Connection: Keep-alive\r\n 
Cache-Control: max-age=0\r\n 
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,;q=0.8\r\n 
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.91 Safari/537.36\r\n 
Accept-Encoding: gzip, deflate, sdch\r\n 
Accept-Language: en-US,en;q=0.8\r\n\r\n"), 

0) > 0) 

{ 
    printf("GET send from %d\n", sockfd); 
} 
else 
{ 
    printf("Problem in send %s\n", strerror(errno)); 
} 

但是，當我編譯它並運行它給了我很多erros。 here is the image of errros。發送此錯誤後，我將發送功能更改爲
send（sockfd，「GET/HTTP/1.1 \ r \ n Host：localhost \ r \ n \ r \ n」，strlen（「GET/HTTP/1.1 \ n主機：localhost \ r \ n \ r \ n「）
編譯OK，但wireshark顯示我HTTP/1.0 400 BAD REQUEST（text/html）所以我沒有幾個問題
1）什麼是我用過的發送函數之間的區別？我的意思是，真的很要緊，如果我送
GET/HTTP/1.1 \ r \ n主機：本地主機\ r \ n \ r \ n
或
GET/HTTP/1.1 \ r \ n 主機：本地主機\ r \ñ 連接：保持活着\ r \ n 緩存控制：最大年齡= 0 \ r \ n 接受：text/html的，應用/ XHTML + xml的，應用/ XML; q = 0.9，圖像/ WEBP，; q = 0.8 \ r \ n 的User-Agent：Mozilla的/ 5.0（X11; Linux的i686的）爲AppleWebKit/537.36（KHTML，例如Gecko）鉻/ 40.0.2214.91 Safari瀏覽器/ 537.36 \ r \ n 接受編碼： gzip的，放氣，SDCH \ r \ n 接受語言：EN-US，EN; q = 0.8 \ r \ n \ r \ n
2）如何配置發送功能來米ake正確的HTTP GET請求？
希望你能幫上忙。謝謝。

Answer 1

你的字符串中有字面換行符！您需要關閉並重新打開每一行上的引號。例如：

if(send(sockfd, 
"GET/HTTP/1.1\r\n" 
"Host: localhost\r\n" 
"Connection: Keep-alive\r\n" 
"Cache-Control: max-age=0\r\n" 
...