我正在开发一个小项目（C 编程）以通过代理进行隧道传输，当我尝试这样做时出现错误：
HTTP/1.0 400 Bad Request
Server: squid/2.7.STABLE9
Date: Mon, 07 Jan 2013 22:20:56 GMT
Content-Type: text/html
Content-Length: 1456
X-Squid-Error: ERR_INVALID_REQ 0
X-Cache: MISS from xt03
Via: 1.0 xt03:80 (squid/2.7.STABLE9)
Connection: close
我发送到代理服务器的数据是：
char msg[] = "CONNECT example.com:80 HTTP/1.0 <CR><LF> HOST example.com:80 <CR><LF> \n";
任何帮助都会很棒！
- - - 更新 - - -
我已经尝试了你们建议的方法，但我仍然遇到错误。我将发布我的整个代码集，看看它是否是套接字中的某些东西导致它发送错误的信息。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define maxlen 2048
int main(int argc, char *argv[])
{
int mysocket;
int len;
char buffer[2000];
char msg[] = "CONNECT example.org:80 HTTP/1.0 \r\n HOST example.org:80 \r\n\r\n";
mysocket = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in dest;
memset(&dest, 0, sizeof(dest));
dest.sin_family = AF_INET;
dest.sin_addr.s_addr = inet_addr("125.39.66.150");
dest.sin_port = htons(80);
connect(mysocket, (struct sockaddr *)&dest, sizeof(struct sockaddr));
send(mysocket, msg, strlen(msg), 0);
len = recv(mysocket, buffer, maxlen, 0);
buffer[len] = '\0';
printf("%s \n", buffer);
close(mysocket);
return 0;
}
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新错误：
HTTP/1.0 400 Bad Request
Server: squid/2.7.STABLE5
Date: Tue, 08 Jan 2013 22:40:24 GMT
Content-Type: text/html
Content-Length: 1158
X-Squid-Error: ERR_INVALID_REQ 0
X-Cache: MISS from DXT-BJ-219
X-Cache-Lookup: NONE from DXT-BJ-219:80
Connection: close
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>ERROR: The requested URL could not be retrieved</TITLE>
<STYLE type="text/css"><!--BODY{background-color:#ffffff;font-family:verdana,sans- serif}PRE{font-family:sans-serif}--></STYLE>
</HEAD><BODY>
<H1>ERROR</H1>
<H2>The requested URL could not be retrieved</H2>
<HR noshade size="1px">
<P>
While trying to process the request:
<PRE>
CONNECT example.com:80 HTTP/1.1
</PRE>
<P>
The following error was encountered:
<UL>
<LI>
<STRONG>
Invalid Request
</STRONG>
</UL>
<P>
Some aspect of the HTTP Request is invalid. Possible problems:
<UL>
<LI>Missing or unknown request method
<LI>Missing URL
<LI>Missing HTTP Identifier (HTTP/1.0)
<LI>Request is too large
<LI>Content-Length missing for POST or PUT requests
<LI>Illegal character in hostname; underscores are not allowed
</UL>
<P>Your cache administrator is <A HREF="mailto:noc_admin@163.com">noc_admin@163.com</A>.
<BR clear="all">
<HR noshade size="1px">
<ADDRESS>
by DXT-BJ-219
</ADDRESS>
</BODY></HTML>