Example Error Trapping Handler
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Express Error Handling Example
Desktop App Development TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Complete Example for Error Handlers Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 This code example includes elements for both page-level and application-level exception handling. Code express error handling best practices Example Files The example consists of the following files: Web.config Global.asax Default.aspx ExceptionUtility (to be put in the App_Code folder) GenericErrorPage.aspx HttpErrorPage.aspx Http404ErrorPage.aspx DefaultRedirectErrorPage.aspx Web.config The following example shows the Web.config file. The customErrors section specifies how to handle errors that occur with file types that are mapped to ASP.NET, such as .aspx, .asmx, and .ashx files. (In IIS 6.0 and in IIS 7.0 in classic mode, static content files such as .html and .jpg files are not mapped to ASP.NET.) The settings in the example customErrors section cause any unhandled HTTP 404 (file not found) errors to be directed to the Http404ErrorPage.aspx file. These HTTP 404 errors would occur if a request were made for an .aspx file, .asmx file, and so on and if the requested file did not exist. All other unhandled errors in ASP.NET files are directed to the DefaultRedirectErrorPage.aspx file. If static content files are not handled by ASP.NET, a request for a nonexistent .html or .jpg file does not cause a redirect to the Http404ErrorPage.aspx file. If you want ASP.NET to handle requests for
About Blog Sign In Free Trial Production Practices Joyent Node.js Production Practices Design Error Handling Design EventEmitter Streams Control Flow Coding Style Linting Logging Client Server Specific Software Error Handling Deploy Cluster Domains Deploying New Versions Service Management Dependency Management Debug Debugging Performance Issues https://www.joyent.com/node-js/production/design/errors Debug a Running Process (DTrace) Postmortem Postmortem Debugging with mdb Logging MDB Modules Share: Error Handling in Node.js Error handling is a pain, and it's easy to get by for a long time in Node.js without http://php.net/manual/en/function.set-error-handler.php dealing with many errors correctly. But building robust Node.js apps requires dealing properly with errors, and it's not hard to learn how. If you're really impatient, skip down to the "Summary" section for a tl;dr. This document error handling will answer several questions that programmers new to Node.js often ask: In functions that I write, when should I throw an error, and when should I emit it with a callback, event emitter, or something else? What should my functions assume about their arguments? Should I check that they're the correct types? Should I check more specific constraints, like that an argument is non-null, is non-negative, looks like an IP address, or the express error handling like? How should I deal with arguments that don't match what the function expects? Should I throw an exception or emit an error to the callback? How can I programmatically distinguish between different kinds of errors (e.g., a "Bad Request" error vs. a "Service Unavailable" error)? How can I provide enough detail with my errors so that callers can know what to do about them? How should I handle unexpected errors? Should I use try/catch, domains, or something else? This document is divided into several parts that build on one another: Background: what you're expected to know already. Operational errors vs. programmer errors: introduction to two fundamentally different kinds of errors Patterns for writing functions: general principles for writing functions that produce useful errors Specific recommendations for writing new functions: a checklist of specific guidelines for writing robust functions that produce useful errors An example: example documentation and preamble for a connect function Summary: a summary of everything up to this point Appendix: Conventional properties for Error objects: a list of property names to use for providing extra information in a standard way Background This document assumes: You're familiar with the idea of exceptions in JavaScript, Java, Python, C++, or any similar language, and that you know what it means to throw and catch them. You're f
Errors Exceptions Generators References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting Using Register Globals User Submitted Data Magic Quotes Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Safe Mode Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Credit Card Processing Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation Keyboard Shortcuts? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search(current page) / Focus search box set_exception_handler » « restore_exception_handler PHP Manual Function Reference Affecting PHP's Behaviour Error Handling Error Handling Functions Change language: English Brazilian Portuguese Chinese (Simplified) French German Japanese Korean Romanian Russian Spanish Turkish Other Edit Report a Bug set_error_handler (PHP 4 >= 4.0.1, PHP 5, PHP 7)set_error_handler — Sets a user-defined error handler function Description mixed set_error_handler ( callable $error_handler [, int $error_types = E_ALL | E_STRICT ] ) Sets a user function (error_handler) to handle errors in a script. This function can be used for defining your own way of handling errors during runtime, for example in applications in which you need to do cleanup of data/files when a critical error happens, or when you need to trigger an error under certain conditions (using trigger_error()). It is important to remember that the standard PHP error handler is completely bypassed for the error types specified by error_types unless the cal