dongzhuang1923
2018-01-30 13:31
浏览 77
已采纳

PHP udp服务器:无法连接到远程主机

I get this error message, when try connect to tiny UDP server. The source code is minimized and looks like so:

//server.php

$server_host = '127.0.0.1';
$server_port = 21665;
$poll_interval = 0.5;
$socket = socket_create(AF_INET, SOCK_DGRAM, 0);
socket_bind($socket, $server_host, $server_port);

$clients = [$socket];
while(true) {
    $read = $clients;
    $write = [];
    $except = [];

    if (socket_select($read, $write, $except, $poll_interval) < 1){
        continue;
    }

    if (in_array($socket, $read)) {
        echo "Client submitted request!
";
        //request parsing                   
    }                
}

So, when I run the server with $ php server.php it hangs for ever, as it should. When however I try to connect to it through telnet to post a request I get an error message:

$ telnet 127.0.0.1 21665
Trying 127.0.0.1 ...
Telnet: unable to connect to remote host: Connection refused

What I'm doing wrong and how can I fix it?

图片转代码服务由CSDN问答提供 功能建议

我在尝试连接到微型UDP服务器时收到此错误消息。 源代码最小化,如下所示:

  // server.php 
 
 $ server_host ='127.0.0.1'; 
 $ server_port = 21665; \  n $ poll_interval = 0.5; 
 $ socket = socket_create(AF_INET,SOCK_DGRAM,0); 
socket_bind($ socket,$ server_host,$ server_port); 
 
 $ clients = [$ socket]; 
while(true)  {
 $ read = $ clients; 
 $ write = []; 
 $ except = []; 
 
 if(socket_select($ read,$ write,$ except,$ poll_interval)&lt; 1){  
继续; 
} 
 
 if(in_array($ socket,$ read)){
 echo“客户端提交的请求!
”; 
 //请求解析
} 
} 
 <  / code>  
 
 

因此,当我使用 $ php server.php 运行服务器时,它将永远挂起,应该如此。 然而,当我尝试通过telnet连接到它发布请求时,我收到一条错误消息:

  $ telnet 127.0.0.1 21665 
Trying 127.0.0.1 ... 
Telnet  :无法连接到远程主机:连接被拒绝
   
 
 

我做错了什么以及如何解决?

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1条回答 默认 最新

  • dtu15253 2018-01-30 13:55
    已采纳

    What I'm doing wrong

    You are using telnet (a TCP client) to try to connect to a UDP port.

    how can I fix it

    Use a client that supports UDP, for example netcat as explained in this answer: telnet counterpart for udp

    nc -u <host> <port>
    

    Start typing and press enter.

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