服务器显示文本而不是HTML [英] Server displaying text instead of HTML
本文介绍了服务器显示文本而不是HTML的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试制作一个C服务器，该服务器将接受输入，并能够通过html格式将其吐回给用户，而该服务器用作用户界面. 我目前无法弄清的当前问题是，为什么C服务器在localhost:3838上以文本形式显示HTML代码，而不是将其显示为适当的网页.
I'm attempting to make a C server that will take inputs and be able to spit them back out to the user via html format where the server works as a user interface. My current issue I cant seem to figure out is why the C server spits out the HTML code as text at localhost:3838 instead of displaying it as a proper web page.
我该如何解决这个问题，并使它能够将用户命令发送回服务器并吐出正确的响应?我是否通过使用recieve然后将消息放入缓冲区，解析该消息，然后将该响应放入缓冲区以使用send发送回去来做到这一点?
How can I solve this and have it be able to work to send user commands back to the server and spit out the proper response? Do I do this by using recieve and then putting the message into a buffer, parsing that message, and then putting that response into a buffer to send back using send?
CSERVER.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
#define PORT "3838" //port being connected to
#define MAXLEN 800
#define BACKLOG 10 //number of pending connections to be held in queue
//format of html page
char header []=
"<!DOCTYPE html>\n"
"<html>\n"
"<head>\n"
"<title>Web-Based Remote Command Server</title>\n"
"</head>\n"
"<body>\n\n";
char input []=
"<form action= \"/run\" method= \"get\"> \n"
"Command: <input type=\"text\" size=\"100\" name=\"command\">\n"
"<input type=\"submit\" value=\"Run\">\n"
"</form>";
char output []= "<p>Command that was run:</p>\n"
"<pre>Your server will include the command that was just run here.</pre>\n\n"
"<p>Standard Output:</p>\n""<pre>Your server will include the stdout results here.</pre>\n\n"
"<p>Standard Error:</p>\n"
"<pre>Your server will include the stderr results here.</pre>\n\n"
"</body>\n""</html>";
char *buff = header;
void sigchld_handler(int s)
{
(void)s; // quiet unused variable warning
// waitpid() might overwrite errno, so we save and restore it:
int saved_errno = errno;
while(waitpid(-1, NULL, WNOHANG) > 0);
errno = saved_errno;
}
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
int main (void){
int sockfd;
int new_fd;
struct addrinfo hints;
struct addrinfo *serverinfo;
struct addrinfo *p;
struct sockaddr_storage client_addr;
socklen_t addrsize;
struct sigaction sa;
int yes = 1;
char s[INET6_ADDRSTRLEN];
int status;
memset(&hints, 0, sizeof hints); //makes struct empty
hints.ai_family = AF_UNSPEC; //IPv4 or v6
hints.ai_socktype = SOCK_STREAM; //TCP type need
hints.ai_flags = AI_PASSIVE; //Fill in IP for us
//if can't get address info print error
if((status = getaddrinfo(NULL, PORT, &hints, &serverinfo)) != 0){
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
return 1;
}
for(p = serverinfo; p != NULL; p = p->ai_next){
if((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1){
perror("server: socket");
continue;
}
if(setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1){
perror("setsockopt");
exit(1);
}
if(bind(sockfd, p->ai_addr, p->ai_addrlen) == -1){
close(sockfd);
perror("server: bind");
continue;
}
break;
}
freeaddrinfo(serverinfo);
if(p == NULL){
fprintf(stderr, "server: failed to bind\n");
exit(1);
}
if(listen(sockfd, BACKLOG) == -1){
perror("listen");
exit(1);
}
sa.sa_handler = sigchld_handler; // reap all dead processes
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
perror("sigaction");
exit(1);
}
printf("server: waiting for connections....\n");
while(1){
addrsize = sizeof client_addr;
new_fd = accept(sockfd, (struct sockaddr *)&client_addr, &addrsize);
if(new_fd == -1){
perror("Did not accept");
continue;
}
inet_ntop(client_addr.ss_family, get_in_addr((struct sockaddr *)&client_addr), s, sizeof s);
printf("server: got connection from %s\n", s);
if(!fork()){
close(sockfd);
int bufsize = 1024;
char *buffer = malloc(bufsize);
recv(new_fd, buffer, bufsize, 0);
write(new_fd, "HTTP/1.1 200 OK\n", 16);
write(new_fd, "Content-length: 46\n", 19);
write(new_fd, "Content-type: text/html\n\n", 25);
write(new_fd, "<html><head>\n<title>The Web Page</title>\n</head>\n</html>", 46);
if(send(new_fd, header, MAXLEN, 0) == -1)
perror("send");
close(new_fd);
exit(0);
}
close(new_fd);
}
return 0;
}
推荐答案
您需要添加这样的响应头:
You need to add the response headers like this one :
例如，SO为此页面发送的响应标头是:
for example the response header send by SO for this page is:
HTTP/2.0 200 OK
cache-control: private
content-type: text/html; charset=utf-8
content-encoding: gzip
x-frame-options: SAMEORIGIN
x-request-guid: 599a5768-3cc6-4b94-86e1-e1d1daa8acd5
strict-transport-security: max-age=15552000
content-security-policy: upgrade-insecure-requests
accept-ranges: bytes
date: Tue, 07 May 2019 13:17:15 GMT
via: 1.1 varnish
x-served-by: cache-lcy19237-LCY
x-cache: MISS
x-cache-hits: 0
x-timer: S1557235035.073229,VS0,VE89
vary: Accept-Encoding,Fastly-SSL
x-dns-prefetch-control: off
content-length: 35669
X-Firefox-Spdy: h2
这篇关于服务器显示文本而不是HTML的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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