web-services - Perl/SOAP 精简版 : "Server was unable to process request. Object reference not set to an instance of an object"

Question

我正在尝试使用一个已经存在的 Web 服务，并且效果很好。在阅读了许多教程和示例后，我终于设法从服务器上得到了答案:

Server was unable to process request. Object reference not set to an instance of an object

WS 只允许您从 NT 登录中获取和 ID(一个字符串参数，一个字符串答案)。

这是我的 perl 脚本:

#!perl -w
use strict;
use warnings;

use LWP::UserAgent; 
use SOAP::Lite on_action => sub { "$_[0]$_[1]"; };
use LWP::Debug; LWP::Debug::level('+'); SOAP::Lite->import(+trace => 'all');
#use SOAP::Lite  +trace =>  'debug';
#sub SOAP::Transport::HTTP::Client::get_basic_credentials { return ('user' => 'pwd') };
use Data::Dumper;

my $var = SOAP::Data->new(name => 'NTLogin', value => "1234", type =>'s:string');

my $resultLogin = SOAP::Lite
  -> uri('http://xxxxx')
  -> proxy('http://yyyyy/zzzzz/directory.asmx')
  -> on_action( sub { join '/', @_ } )
  -> GetUIDFromNTLogin($var);

print "lets test it...\n\n";

  print $resultLogin;
  print "\nresult():\n";
  print $resultLogin->result();

这是输出:

Launching NT to UID conversion
SOAP::Data::new: ()
SOAP::Lite::new: ()
LWP::UserAgent::new: ()
SOAP::Transport::HTTP::Client::new: ()
SOAP::Lite::call: ()
SOAP::Serializer::envelope: ()
SOAP::Serializer::envelope: GetUIDFromNTLogin SOAP::Data=HASH(0x______)
SOAP::Data::new: ()
SOAP::Data::new: ()
SOAP::Data::new: ()
SOAP::Data::new: ()
SOAP::Data::new: ()
SOAP::Transport::HTTP::Client::send_receive: HTTP::Request=HASH(0x______)
SOAP::Transport::HTTP::Client::send_receive: POST http://yyyyy/zzzzz/directory.asmx
Accept: text/xml
Accept: multipart/*
Content-Length: 534
Content-Type: text/xml; charset=utf-8
SOAPAction: http://tempuri.org/GetUIDFromNTLogin

<?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope xmlns:xsi="http://www.w
3.org/1999/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/e
ncoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="
http://www.w3.org/1999/XMLSchema" SOAP-ENV:encodingStyle="http://schemas.xmlsoap
.org/soap/encoding/"><SOAP-ENV:Body><namesp1:GetUIDFromNTLogin xmlns:namesp1="ht
tp://tempuri.org"><NTLogin xsi:type="s:string">1234</NTLogin></namesp1:
GetUIDFromNTLogin></SOAP-ENV:Body></SOAP-ENV:Envelope>
LWP::UserAgent::request: ()
LWP::UserAgent::send_request: POST http://yyyyy/zzzzz/directory.asmx
LWP::UserAgent::_need_proxy: Not proxied
LWP::Protocol::http::request: ()
LWP::Protocol::collect: read 441 bytes
LWP::UserAgent::request: Simple response: Internal Server Error
SOAP::Transport::HTTP::Client::send_receive: HTTP::Response=HASH(0x______)
SOAP::Transport::HTTP::Client::send_receive: HTTP/1.1 500 Internal Server Error
Cache-Control: private
Date: Mon, 04 Jun 2012 15:54:47 GMT
Server: Microsoft-IIS/6.0
Content-Length: 441
Content-Type: text/xml; charset=utf-8
Client-Date: Mon, 04 Jun 2012 15:54:47 GMT
Client-Peer: 10.94.61.146:80
Client-Response-Num: 1
Set-Cookie: BIGipServer_____________-http=_________________; path=/
X-AspNet-Version: 2.0.50727
X-Powered-By: ASP.NET

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.
xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault><faultcode
>soap:Server</faultcode><faultstring>Server was unable to process request. ---&g
t; Object reference not set to an instance of an object.</faultstring><detail />
</soap:Fault></soap:Body></soap:Envelope>
SOAP::Deserializer::deserialize: ()
SOAP::Parser::decode: ()
SOAP::SOM::new: ()
SOAP::Lite::DESTROY: ()
SOAP::Deserializer::DESTROY: ()
SOAP::Transport::DESTROY: ()
SOAP::Transport::HTTP::Client::DESTROY: ()
SOAP::Serializer::DESTROY: ()
SOAP::Data::DESTROY: ()
SOAP::Data::DESTROY: ()
SOAP::Data::DESTROY: ()
SOAP::Data::DESTROY: ()
SOAP::Data::DESTROY: ()
lets test it...

1
result():
SOAP::SOM::DESTROY: ()
SOAP::Data::DESTROY: ()
SOAP::Parser::DESTROY: ()
SOAP::Transport::DESTROY: ()
SOAP::Serializer::DESTROY: ()
SOAP::Deserializer::DESTROY: ()
SOAP::Lite::DESTROY: ()
Press any key to continue . . .

经过一些研究，我得到了错误出在 WS 服务器端的印象。然而 WS 似乎工作得很好，所以我猜我的 Perl 脚本有问题，但我不知道是什么......

任何帮助将不胜感激!

谢谢，

[更新 #1]

这是WS页面给出的示例:

请求

POST /zzzzz/directory.asmx HTTP/1.1
Host: yyyyy
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://xxxxx/GetUIDFromNTLogin"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <GetUIDFromNTLogin xmlns="http://xxxxx/">
      <NTLogin>string</NTLogin>
    </GetUIDFromNTLogin>
  </soap:Body>
</soap:Envelope>

回复

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <GetUIDFromNTLoginResponse xmlns="http://xxxxx/">
      <GetUIDFromNTLoginResult>string</GetUIDFromNTLoginResult>
    </GetUIDFromNTLoginResponse>
  </soap:Body>
</soap:Envelope>

[更新 #2]

这是 user1215106 建议的输出:

<HTML>
<HEAD><TITLE>An Error Occurred</TITLE></HEAD>
<BODY>
<H1>An Error Occurred</H1>
400 Bad Request
</BODY>
</HTML>

Answer 1

请测试下面的代码，让我们知道您的经验和输出。

#!perl -w 

use strict; 
use warnings;
use LWP::UserAgent; 
use SOAP::Lite

use LWP::Debug; LWP::Debug::level('+'); SOAP::Lite->import(+trace => 'all');

print SOAP::Lite 
  -> uri('http://xxxxx') 
  -> proxy('http://yyyyy/zzzzz/directory.asmx') 
  -> on_action(sub { sprintf '"%s"', shift })
  -> on_fault(sub {
       my($soap, $res) = @_; 
       die ref $res ? $res->faultstring : $soap->transport->status, "\n";
     })
  -> GetUIDFromNTLogin(SOAP::Data->type('string')->name('NTLogin')->value(1234))
  -> result;

[更新]

根据您发布的信息，建议您直接执行 HTTP::Request代码，无库 SOAP::Lite .使用您拥有的确切信息修改以下代码:

#!perl -w          

use strict;          
use warnings;

use LWP::UserAgent;
use HTTP::Request;

my $message = '<SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/1999/XMLSchema" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><namesp1:GetUIDFromNTLogin xmlns:namesp1="http://tempuri.org"><NTLogin xsi:type="s:string">1234</NTLogin></namesp1: GetUIDFromNTLogin></SOAP-ENV:Body></SOAP-ENV:Envelope>';

my $userAgent = LWP::UserAgent->new();
my $request = HTTP::Request->new(POST => 'http://...');
$request->header(SOAPAction => '"http://tempuri.org/GetUIDFromNTLogin"');
$request->content($message);
$request->content_type("text/xml; charset=utf-8");

my $response = $userAgent->request($request);

if ($response->code == 200) {
  print $response->as_string;
}
else {
  print $response->error_as_HTML;
}