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Troubleshooting Auto Scaling
Auto Scaling provides specific and descriptive errors to help you troubleshoot problems.
Retrieving Errors
Typically, you want your application to check if a request generated an
error before processing results. The easiest way to find out if an error
occurred is to look for an Error node in the response.
XPath syntax provides a simple way to search for the presence of an Error
node, as well as an easy way to retrieve the error code and message. The following code snippet
uses Perl and the XML::XPath module to determine whether an error occurred during a request. If an
error occurred, the code prints the first error code and message in the response.
use XML::XPath;
my $xp = XML::XPath->new(xml =>$response);
if ( $xp->find("//Error") )
{print "There was an error processing your request:\n", " Error code: ",
$xp->findvalue("//Error[1]/Code"), "\n", " ",
$xp->findvalue("//Error[1]/Message"), "\n\n"; }Troubleshooting Tips
We recommend the following processes to diagnose and resolve problems with your Auto Scaling applications:
Verify that your XSL style sheets are valid.
To do this, run your requests both with and without the XSL style sheet, to determine if the problem is in the request or in your style sheets.
Check the structure of your request.
Each Auto Scaling operation has a reference page. Double-check that you are using parameters correctly. Try the request on one of the other locales, if other locales exist. Try your request with SOAP through your browser. This will help you determine if the problem lies with your code or your request or with Auto Scaling.
Look at the sample applications and use cases to see if those examples are performing similar operations.
