无法通过python通过HTTP（通过TCP）发送文件。我的代码有什么问题？

Question

我已经在python中创建了一个服务器，并且在请求文件时试图将文件发送到客户端。服务器收到请求，但不能通过TCP发送文件。

我使用了一个模板来创建一个响应头，然后我尝试发送该文件，但它并不完全工作。我能够“发送”.py和.html文件，而且它们在我的浏览器中显示，但它一定是运气，因为根据我的技术援助，真正的测试是图像...这不适合我。

首先，我将发布标题和响应，如Firefox插件Firebug，然后是我的代码，最后是错误消息。

Firebug的请求和响应

----------------------------

响应Headersview源

Accept-Ranges bytes 
Connection Keep-Alive (or Connection: close)Content-Type: text/html; charset=ISO-8859-1 
Content-Length 10000 
Keep-Alive timeout=10, max=100 

请求Headersview源

Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 
Accept-Encoding gzip, deflate 
Accept-Language en-US,en;q=0.5 
Connection keep-alive 
Host xxx.xxx.244.5:10000 
User-Agent Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0 

**我的Python代码：**

#import socket module 
from socket import * 
serverSocket = socket(AF_INET, SOCK_STREAM) 
#Prepare a server socket 
serverPort = 10000 
serverName = 'xxx.xxx.xxx.xx' #Laptop IP 
serverSocket.bind((serverName,serverPort)) 
serverSocket.listen(5) 

while True: 
    #Establish the connection 
    print 'Ready to serve...' 
    connectionSocket, addr = serverSocket.accept() 
    print addr 

    try: 
     message = connectionSocket.recv(4096) 
     filename = message.split()[1] 
     f = open(filename[1:]) 
     outputdata = f.read() 
     f.close() 
     print 'length of output data: ' 
     print len(outputdata) 
     print filename 
     print message 
     header = ("HTTP/1.1 200 OK\r\n" 
     "Accept-Ranges: bytes\r\n" 
     "Content-Length: 100000\r\n" 
     "Keep-Alive: timeout=10, max=100\r\n" 
     "Connection: Keep-Alive\r\n (or Connection: close)" 
     "Content-Type: text/html; charset=ISO-8859-1\r\n" 
     "\r\n") 
     connectionSocket.send(header) 
     #Send the content of the requested file to the client 
     for i in range(0, len(outputdata)): 
       connectionSocket.sendall(outputdata[i])   
     connectionSocket.close() 


     print '\ntry code has executed\n' 

    except IOError: 
     print 'exception code has been executed' 
     connectionSocket.send('HTTP/1.1 404 Not found: The requested document does not exist on this server.') 
     connectionSocket.send('If you can read this, then the exception code has run') 
     print '\tconnectionSocket.send has executed' 
     connectionSocket.close() 
     print '\tconnectionSocket.close has executed\n' 
#serverSocket.close() 

这里是错误消息：

此图片 “http://xxx.xxx.244.5:10000/kitty.jpg” 无法显示，因为它包含错误。

预先感谢您！

Answer 1

以二进制模式打开您的JPEG文件：open(filename[1:], "rb")。否则，Python将帮助将文件中的某些字节转换为\n字符，这将破坏图像并阻止浏览器对其进行任何修改。

此外，您应该使用的image/jpeg作为JPEG图像，而不是text/html，尽管您的浏览器似乎已经发现它是JPEG。