tutorialspoint 使用 tcpsocket 的简单网络浏览器

Question

这段代码应该可以获取任何网页的内容：

require 'socket'

host = 'www.tutorialspoint.com'     # The web server
port = 80                           # Default HTTP port
path = "/index.htm"                 # The file we want 

# This is the HTTP request we send to fetch a file
request = "GET #{path} HTTP/1.0\r\n\r\n"

socket = TCPSocket.open(host,port)  # Connect to server
socket.print(request)               # Send request
response = socket.read              # Read complete response
# Split response at first blank line into headers and body
headers,body = response.split("\r\n\r\n", 2) 
puts headers
puts body                          

当我在命令行中运行它时，我得到一个 404 错误，但是当我去 www.tutorialspoint.com/index.htm 时它就在那里，那是什么？：

404 Error Information

虽然，我使用 open-uri 库来获取网页内容没有问题。不过我想知道这个怎么用。

Answer 1

您的请求缺少 Host 参数：

host = 'www.tutorialspoint.com'     # The web server
port = 80                           # Default HTTP port
path = "/index.htm"                 # The file we want 

# This is the HTTP request we send to fetch a file
request = "GET #{path} HTTP/1.0\r\nHost: #{host}\r\n\r\n"

请注意，显然并非所有网络服务器都需要“Host:”行（但请参阅 cmets）。