C#CR后必须跟随LF [英] C# CR must be followed by LF

问题描述

我自己编写了一个非常简单的HTTP服务器，然后使用C#Windows窗体检索HTTP服务器的内容.我的C#程序总是说违反协议，CR后必须加LF.我知道可以通过将配置文件添加到C#项目中来解决此问题.但是我想知道确切的原因.我的http服务器代码在下面.

I write a very simple HTTP server by myself, and I use the C# Windows Form to retrieve the content of my HTTP server. My C# program always said protocol violation, CR must be followed by LF. I know this issue can be solved by adding Configuration Files to C# Projects. But I want to know the exactly reason. My http server code is in below.

/*
 * This will handle connection for each client
 * */
void *httpconnection_handler(void *socket_desc)
{
    //Get the socket descriptor
    int sock = *(int*)socket_desc;
    int read_size;
    char *message = "HTTP/1.1 200 OK\r\nContent-Type: text/xml; \r\ncharset=utf-8\r\n\r\n";
    char *end = "\r\n";
    char send_message[3000] = {0};

    //Send some messages to the client
    char * buffer = 0;
    long length;
    FILE * f = fopen ("/mnt/internal_sd/device-desc.xml", "r");
    if (f)
    {
      fseek (f, 0, SEEK_END);
      length = ftell (f);
      fseek (f, 0, SEEK_SET);
      buffer = malloc (length);
      if (buffer)
      {
        fread (buffer, 1, length, f);
      }
      fclose (f);
    }

    strcat(send_message, message);
    strcat(send_message, buffer);
    strcat(send_message, end);


    write(sock , send_message , length + strlen(message));
    sleep(1);
    shutdown(sock, SHUT_WR);
    //Free the socket pointer
    close(sock);

    return 0;
}

我的C#代码在下面.

using (WebClient webClient = new WebClient())
{
    webClient.Encoding = Encoding.UTF8;
    contents = webClient.DownloadString(url);
}

确切的异常消息是

RequestFailed:服务器已违反协议. Section = ResponseHeader Detail = CR后必须加上LF

RequestFailed: The server committed a protocol violation. Section=ResponseHeader Detail=CR must be followed by LF

推荐答案

可能是因为Content-Type标头中包含了\r\n. charset应该是Content-Type标头行的一部分.

It may be because of the \r\n you have inside of your Content-Type header. The charset should be part of the Content-Type header line.

char *message = "HTTP/1.1 200 OK\r\nContent-Type: text/xml;charset=utf-8\r\n\r\n";

这篇关于C#CR后必须跟随LF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！