Description:
------------
We need to connect to SSL WebService through Squid proxy.

When we connect with proxy and without wsdl cache (on disk) - it works fine
When we connect without proxy and with wsdl cache (on disk) - it works fine

when we connect with both wsdl cache on disk and proxy - only first request works (which creates cache file). All subsequent calls fail with "Could not connect to host" error. When cache file is wiped out - next request works fine, and again subsequent throw an error.

another thing is that we have to provide proxy configuration in both SoapClient options and Stream Context. When only provided in one place - same error is thrown ("Could not connect to host").

Test script:
---------------
$opts = array( 'http'=>array( 'proxy'=>'tcp://[proxy host]:3128' ) );
$context = stream_context_create( $opts );

$client = new SoapClient( 'https://webapi.allegro.pl/service.php?wsdl', array( 'proxy_host'=>'[proxy host]', 'proxy_port'=>3128, 'cache_wsdl'=>WSDL_CACHE_BOTH, 'stream_context'=>$context ) );

$request = array(
    'sysvar' => 1,
    'countryId' => 1,
    'webapiKey' => '[secret]'
);

try{
    var_dump( $client->doQuerySysStatus( $request ) );
}catch(SoapFault $e){
    echo $e->getCode() . ' ' . $e->getMessage() . "\n";
}


Expected result:
----------------
WSDL cache should work and it should use cached data when using proxy.

Actual result:
--------------
We can use only wsdl cache or proxy at once. Using both causes connection errors.