#include <u.h>#include <libc.h> enum { bufsize = 8*1024 };char buf[bufsize+1], addr[128], *proto, *host, *port, *path; voidmain(void){	char *f[3], *p, *e;	int con, fd, n, r; 	/* read all the headers */	n = 0;	do {		if(n >= bufsize)			return;		if((r = read(0, buf+n, bufsize-n)) <= 0)			return;		n += r;		buf[n] = 0;	} while(strstr(buf, "\r\n\r\n") == nil); 	/* remove keep alive headers */	if(p = cistrstr(buf, "\nConnection:"))		if(e = strchr(p+1, '\n'))			strcpy(p, e);	if(p = cistrstr(buf, "\nProxy-Connection:"))		if(e = strchr(p+1, '\n'))			strcpy(p, e); 	/* crack first line of http request */	if(e = strchr(buf, '\n'))		*e++ = 0;	r = tokenize(buf, f, 3);	if(r < 2)		return;	if(r == 2)		f[2] = "HTTP/1.0";	proto = f[1];	if(p = strstr(proto, "://")){		*p = 0;		host = p + 3;	} else {		host = proto;		proto = "http";	}	port = proto;	path = "";	if(p = strchr(host, '/')){		*p++ = 0;		path = p;	}	if(*host == '['){		host++;		if(p = strrchr(host, ']')){			*p++ = 0;			if(p = strrchr(p, ':'))				port = ++p;		}	} else if(p = strrchr(host, ':')){		*p++ = 0;		port = p;	} 	snprint(addr, sizeof(addr), "tcp!%s!%s", host, port); 	alarm(30000);	fd = dial(addr, 0, 0, 0);	alarm(0); 	con = cistrcmp(f[0], "CONNECT") == 0;	if(con){		if(fd < 0)			print("%s 500 Connection Failed\r\n\r\n%r\n", f[2]);		else			print("%s 200 Connection Established\r\n\r\n", f[2]);	}	if(fd < 0)		return; 	switch(rfork(RFPROC|RFFDG|RFNOWAIT)){	case -1:		return;	case 0:		dup(fd, 0);		break;	default:		dup(fd, 1);		if(!con)			print("%s /%s %s\r\nConnection: close\r\n%s", f[0], path, f[2], e);	} 	while((r = read(0, buf, sizeof(buf))) > 0)		if(write(1, buf, r) != r)			break; 	postnote(PNGROUP, getpid(), "kill");}