簡單的C套接字HTTP程序找不到資源：404

我有我在AWS中運行的spring-boot服務器。服務器工作正常。我可以使用chrome，postman和curl訪問它，沒有任何問題。但是，我有一個運行C的嵌入式設備，我正在使用套接字嘗試連接到我的服務器。嵌入式設備正在運行Linux，因此我可以使用curl與服務器通信而不會出現問題。但是，我的C套接字代碼似乎無法找到服務器上的資源。我一直在404。簡單的C套接字HTTP程序找不到資源：404

這裏是我的嵌入式客戶端的代碼，

#include <stdarg.h> 
#include <stdio.h> 
#include <errno.h> 
#include <string.h> 
#include <sys/socket.h> 
#include <resolv.h> 
#include <errno.h> 


int main() { 

    // Define some parameters 
    int sockfd, bytes_read; 
    struct sockaddr_in dest; 
    char buffer[4000]; 
    char hdr[1000]; 

    // Create Server Client Strings 
    bzero(hdr, sizeof(hdr)); 
    strcpy(hdr, "GET /hello HTTP/1.1\r\n"); 
    strcat(hdr, "Host: 52.200.39.81\r\n\r\n"); 

    // Clean things up a bit before sarting 
    printf("\n\n"); 

    // Create Socket 
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 
      printf("Socket not created\n"); 
      return 0; 
    } 

    // Initialize server address/port struct 
    bzero(&dest, sizeof(dest)); 

    // *** Added this line to fix the code *** 
    dest.sin_addr.s_addr = inet_addr("52.200.39.81", &dest.sin_addr.s_addr); 

    dest.sin_family = AF_INET; 
    dest.sin_port = htons(8080); 
    if (inet_addr("52.200.39.81", &dest.sin_addr.s_addr) == 0) { 
     printf("Incorrect Address Expression\n"); 
     return 0; 
    } 

    // Connect Socket 
    if (connect(sockfd, (struct sockaddr*)&dest, sizeof(dest)) != 0) { 
     printf("Socket Connection Failed\n"); 
     close(sockfd); 
     return 0; 
    } 

    // Send data 
    if (send(sockfd, hdr, strlen(hdr), 0) < 0) { 
     printf("Send Data Failed\n"); 
     return 0; 
    } 

    printf("Socket successfully sent\n"); 
    printf("\nSend Message - TxBufferSize = %d\n\n",strlen(hdr)); 
    printf("%s", hdr); 

    bzero(buffer, sizeof(buffer)); 
    bytes_read = recv(sockfd, buffer, sizeof(buffer), 0); 

    if (bytes_read < 0) { 
     printf("Read Data Failed\n"); 
    } 

    if (bytes_read > 0) { 
     // Print out receive buffer 
     printf("\n\nReceived Message -- RxSize = %d \n\n", strlen(buffer)); 
     printf("%s", buffer); 
    } 

    if (bytes_read == 0) { 
     printf("No Read Bytes Received\n"); 
    } 

    /*---Clean up---*/ 
    close(sockfd); 
    return 0; 
}

下面是我回來後，

[email protected]:~$ ./helloworld 


Socket successfully sent 

***** Send Message -- TxBufferSize = 80 ***** 

GET http://52.200.39.81:8080/hello HTTP/1.1 
Host: 52.200.39.81 
accept: */* 



***** Received Message -- RxBufferSize = 467 ***** 

HTTP/1.1 404 Not Found 
Date: Sat, 02 Apr 2016 17:36:37 GMT 
Server: Apache/2.2.22 (Debian) 
Vary: Accept-Encoding 
Content-Length: 283 
Content-Type: text/html; charset=iso-8859-1 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> 
<html><head> 
<title>404 Not Found</title> 
</head><body> 
<h1>Not Found</h1> 
<p>The requested URL /hello was not found on this server.</p> 
<hr> 
<address>Apache/2.2.22 (Debian) Server at 52.200.39.81 Port 8080</address> 
</body></html> 
[email protected]:~$

如果我使用curl命令在嵌入式設備上，

[email protected]:~$ curl 52.200.39.81:8080/hello 
Greetings WebServiceTest1 -- ServiceCount = 11 
[email protected]:~$

我從服務器得到正確的迴應。所以我相信嵌入式設備正在與我的服務器通話。只是似乎無法讓套接字代碼工作。任何幫助，將不勝感激。

來源

2016-04-02 skmansfield

如果使用verbose標誌執行curl：curl -v 52.200.39.81:8080/hello，您可以看到它發送的標頭。嘗試使用「GET/hello HTTP/1.1 \ r \ n」而不是「GET http://52.200.39.81:8080/hello HTTP/1.1 \ r \ n」 –

我嘗試了「Get/hello HTTP/1.1 \ r \ ñ「沒有運氣。好的建議curl -v ...我試了一下，並將標題完全複製到我的程序中，沒有運氣。這很麻煩。我在其他平臺上完成了這個確切的過程。 – skmansfield

我修改了這個問題中的代碼http://stackoverflow.com/questions/11208299/http-get-request-using-c-without-libcurl。試試這個代碼：http://pastebin.com/MNHLS77c，打個招呼，./hello 52.200.39.81，它的工作原理，你可以通過比較 –

好的，我發現問題是什麼。我沒有設置套接字地址。一個非常簡單的遺漏，但問題是什麼。我已經更新了代碼，現在它正在工作。我添加了gethostbyname以使代碼更加標準化。新的代碼行位於註釋部分「//初始化服務器地址/端口結構」。我想感謝Lilas爲我提供的參考代碼，導致我忽略了dest.sin_addr.s_addr行。以下是更正後的代碼。

#include <stdarg.h> 
#include <stdio.h> 
#include <string.h> 
#include <sys/socket.h> 
#include <resolv.h> 
#include <netdb.h> 

int main() { 

    // Define some parameters 
    int sockfd, bytes_read; 
    struct sockaddr_in dest; 
    char *hostname = "skmdev1.net"; 
    struct hostent *hostent; 
    char buffer[4000]; 
    char hdr[1000]; 

    // Create Server Client Strings 
    bzero(hdr, sizeof(hdr)); 
    strcpy(hdr, "GET /hello HTTP/1.1\r\n"); 
    strcat(hdr, "Host: skmdev1.net\r\n\r\n"); 

    // Clean things up a bit before sarting 
    printf("\n\n"); 

    // Build the address 
    hostent = gethostbyname(hostname); 
    if (hostent == NULL) { 
     printf("error: gethostbyname(\"%s\")\n", hostname); 
     return 0; 
    } 

    // Create Socket 
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 
      printf("Socket not created\n"); 
      return 0; 
    } 

    // Initialize server address/port struct 
    bzero(&dest, sizeof(dest)); 
    dest.sin_family = AF_INET; 
    dest.sin_port = htons(8080); 
    dest.sin_addr.s_addr = inet_addr(inet_ntoa(*(struct in_addr*)hostent->h_addr)); 

    if (dest.sin_addr.s_addr == INADDR_NONE) { 
     printf("Incorrect Address Expression\n"); 
     return 0; 
    } 

    // Connect Socket 
    if (connect(sockfd, (struct sockaddr*)&dest, sizeof(dest)) != 0) { 
     printf("Socket Connection Failed\n"); 
     close(sockfd); 
     return 0; 
    } 

    // Send data 
    if (send(sockfd, hdr, strlen(hdr), 0) < 0) { 
     printf("Send Data Failed\n"); 
     return 0; 
    } 

    printf("Socket successfully sent\n"); 
    printf("\nSend Message - TxBufferSize = %d\n\n",strlen(hdr)); 
    printf("%s", hdr); 

    bzero(buffer, sizeof(buffer)); 
    bytes_read = recv(sockfd, buffer, sizeof(buffer), 0); 

    if (bytes_read < 0) { 
     printf("Read Data Failed\n"); 
    } 

    if (bytes_read > 0) { 
     // Print out receive buffer 
     printf("\n\nReceived Message -- RxSize = %d \n\n", strlen(buffer)); 
     printf("%s\n\n", buffer); 
    } 

    if (bytes_read == 0) { 
     printf("No Read Bytes Received\n"); 
    } 

    /*---Clean up---*/ 
    close(sockfd); 
    return 0; 
}

來源

2016-04-03 15:32:08 skmansfield

簡單的C套接字HTTP程序找不到資源：404

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