PHP cURL错误：“来自服务器的空回复” [英] PHP cURL error: "Empty reply from server"

问题描述

我有一个类函数，用于与 Last.FM 的RESTful API进行交互，其目的是抓取最多我的用户的最近曲目。这是：

  private static $ base_url ='http://ws.audioscrobbler.com/2.0/'; 
 
 public static function getTopTracks（$ options = array（））
 {
 $ options = array_merge（array（
'user'=>'bachya' 
'period'=> NULL，
'api_key'=>'xxxxx ...'，// obfuscated，显然
），$ options）; 
 
 $ options ['method'] ='user.getTopTracks'; 
 
 //初始化cURL请求并设置参数
 $ ch = curl_init（）; 
 curl_setopt_array（$ ch，array（
 CURLOPT_URL => self :: $ base_url，
 CURLOPT_POST => TRUE，
 CURLOPT_POSTFIELDS => $ options，
 CURLOPT_RETURNTRANSFER => TRUE，
 CURLOPT_TIMEOUT => 30，
 CURLOPT_USERAGENT =>'Mozilla / 4.0（兼容; MSIE 5.01; Windows NT 5.0）'
） 
 
 $ results = curl_exec（$ ch）; 
 return $ results; 
} 
  

这会返回 code>。我知道有人建议这个错误来自网络基础设施的一些故障;我不相信这是真的在我的情况。如果我通过命令行运行cURL请求，我得到我的数据; Last.FM服务已启动并可访问。

在我去那些人之前，看看是否有什么改变，我想和你们一起检查一下，

ANSWER：

强的> @Jan Kuboschek帮助我绊倒什么是（可能）在这里。通过给予 CURLOPT_POSTFIELDS 关联数组，指定了特定的内容类型，它可能无法与某些RESTful服务一起使用。更聪明的解决方案是手动创建该数据的URL编码版本，并将其作为 CURLOPT_POSTFIELDS 。

有关详情，请查看： http://www.brandonchecketts.com / archives / array-versus-string-in-curlopt_postfields

解决方案

开始，中间或尾随。

$ b

$ b

我跑了你的代码，有同样的问题 - 没有输出。我试过URL和一个GET请求，服务器对我说。我将执行以下操作：

1. 使用以下作为$ base_url：$ base_url =' http://ws.audioscrobbler.com/2.0/?user= bachya& period =& api_key = xxx& method = user.getTopTracks ';




2. 从您的请求中删除帖子字段。 >

编辑
我已将您的代码移出课堂，因为我没有其余和修改它。以下代码对我来说是完美的。如果这些更改对您无效，我建议您的错误在不同的功能。

 <？php 
 
 
 function getTopTracks（）
 {
 $ base_url ='http://ws.audioscrobbler.com/2.0/?user=bachya&period=&api_key = 8066d2ebfbf1e1a8d1c32c84cf65c91c& method = user.getTopTracks'; 
 $ options = array_merge（array（
'user'=>'bachya'，
'period'=> NULL，
'api_key'=>'xxxxx。 ..'，// obfuscated，显然
））; 
 
 $ options ['method'] ='user.getTopTracks'; 
 
 //初始化cURL请求并设置参数
 $ ch = curl_init（$ base_url）; 
 curl_setopt_array（$ ch，array（
 CURLOPT_URL => $ base_url，
 CURLOPT_RETURNTRANSFER => TRUE，
 CURLOPT_TIMEOUT => 30，
 CURLOPT_USERAGENT => 'Mozilla / 4.0（compatible; MSIE 5.01; Windows NT 5.0）'
））; 
 
 $ results = curl_exec（$ ch）; 
 return $ results; 
} 
 
 echo getTopTracks（）; 
 
？> 
  

I have a class function to interface with the RESTful API for Last.FM - its purpose is to grab the most recent tracks for my user. Here it is:

private static $base_url = 'http://ws.audioscrobbler.com/2.0/';

public static function getTopTracks($options = array())
{
  $options = array_merge(array(
    'user' => 'bachya',
    'period' => NULL,
    'api_key' => 'xxxxx...', // obfuscated, obviously
  ), $options);

  $options['method'] = 'user.getTopTracks';

  // Initialize cURL request and set parameters
  $ch = curl_init();
  curl_setopt_array($ch, array(
    CURLOPT_URL            => self::$base_url,
    CURLOPT_POST           => TRUE,
    CURLOPT_POSTFIELDS     => $options,
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_TIMEOUT        => 30,
    CURLOPT_USERAGENT      => 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)'
  ));

  $results = curl_exec($ch);
  return $results;
}

This returns "Empty reply from server". I know that some have suggested that this error comes from some fault in network infrastructure; I do not believe this to be true in my case. If I run a cURL request through the command line, I get my data; the Last.FM service is up and accessible.

Before I go to those folks and see if anything has changed, I wanted to check with you fine folks and see if there's some issue in my code that would be causing this.

Thanks!

ANSWER: @Jan Kuboschek helped me stumble onto what is (maybe) going on here. By giving CURLOPT_POSTFIELDS an associative array, a particular content-type is specified that may not work with certain RESTful services. A smarter solution is to manually create a URL-encoded version of that data and pass that as the CURLOPT_POSTFIELDS.

For more info, check out: http://www.brandonchecketts.com/archives/array-versus-string-in-curlopt_postfields

解决方案

A common issue are spaces in the URL - beginning, in the middle, or trailing. Did you check that out?

Edit - per comments below, spacing is not the issue.

I ran your code and had the same problem - no output whatsoever. I tried the URL and with a GET request, the server talks to me. I would do the following:

1. Use the following as $base_url: $base_url = 'http://ws.audioscrobbler.com/2.0/?user=bachya&period=&api_key=xxx&method=user.getTopTracks';

2. Remove the post fields from your request.

Edit I moved your code out of the class since I didn't have the rest and modified it. The following code runs perfect for me. If these changes don't work for you, I suggest that your error is in a different function.

<?php


function getTopTracks()
{
  $base_url = 'http://ws.audioscrobbler.com/2.0/?user=bachya&period=&api_key=8066d2ebfbf1e1a8d1c32c84cf65c91c&method=user.getTopTracks';
  $options = array_merge(array(
    'user' => 'bachya',
    'period' => NULL,
    'api_key' => 'xxxxx...', // obfuscated, obviously
  ));

  $options['method'] = 'user.getTopTracks';

  // Initialize cURL request and set parameters
  $ch = curl_init($base_url);
  curl_setopt_array($ch, array(
    CURLOPT_URL            => $base_url,
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_TIMEOUT        => 30,
    CURLOPT_USERAGENT      => 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)'
  ));

  $results = curl_exec($ch);
  return $results;
}

echo getTopTracks();

?>

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