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Api Design Error Handling


What if the implementation doesn't need to throw an exception, or needs to throw other exceptions? All rights reserved. Out of the top of the mind, you can have an approach like the one taken by Haskell, where errors can be signaled via abstract data types with multiple constructors (think While they seem like a perfectly reasonable idea at first glance, they cause many painfull little problems in practice. –hugomg May 3 '12 at 16:55 @missingno: That's because, as check over here

It's generally understood that there can be other exceptions when low-level errors happen or a bug manifests, and which a client can only handle generally by showing an error message and/or Still, I suppose you could use it. –Max May 13 '12 at 18:56 1 No, it's not WebDAV-specific at all. In this case, though, the 403 is entirely appropriate. –Greg Campbell Jun 3 '09 at 5:04 7 I feel this is a pretty unhelpful answer. Both ways work fine.

Api Error Handling Best Practices

It has getSQLState (generic) and getErrorCode (vendor-specific). Coding to interfaces, not implementations We code to interfaces or abstractions to reduce coupling. And secondly, protecting yourself from surprise exceptions is exactly the same practice as DRY- for example, in C++, if you use RAII to ensure cleanup, then it ensures cleanup in all Privacy Policy > View Sample Newsletter > Twitter YouTube Slideshare Facebook RSS View All RSS Feeds > © 2016, O'Reilly Media, Inc. (707) 827-7019 (800) 889-8969 All trademarks and registered trademarks

  1. And, if error codes are so bad (and I don't need to be sold on the vices of error codes), is there another alternative?
  2. Can Customs make me go back to return my electronic equipment or is it a scam?
  3. If the URL specifies an invalid or obsolete id parameter, the service returns an HTTP 404 Not Found Error Code.
  4. This fact means that the HTTP status codes apply to your application; your application is not separate from HTTP in the sense that it needs its own set of error codes.
  5. If you use exceptions properly, the only uncaught ones will be the fatal ones (like OutOfMemory), and for these, crashing right away is the best you can do. –sleske May 7
  6. How are clients best dealing with this?
  7. On the other hand, uncaught exception bugs that are not discovered during testing can appear in a production environment in the form of a crash.

Stack Overflow for example sends out an object with response, data and message properties. It also has the additional disadvantage of mapping all HTTP error codes to application specific error codes. Subtraction with negative result Force Microsoft Word to NEVER auto-capitalize the name of my company Howto prevent chrgrp from clearing “setuid bit”? Error Handling Web Api 2 Not the answer you're looking for?

Use Descriptive Error Messages Again, status codes help developers quickly identify the result of their call, allowing for quick success and failure checks.  But in the event of a failure, it's For all these reasons, I think Option 4 has a lot to offer. On whether exceptions thrown by a method should be part of its declaration, I believe they should: they are part of the contract defined by this interface: This method does A, http://blogs.mulesoft.com/dev/api-dev/api-best-practices-response-handling/ Add as many hints as your API team can think of about what's causing an error.

There the NSError is the preferred way to handle errors, despite the existence of what a Java developer would call true exceptions: @try, @catch, @throw, NSException class, etc. Web Api Global Error Handling I have seen far more egregious non-REST APIs being called "RESTful." At this point (August, 2015) I do recommend that you use the HTTP Status code as part of your API. Return machine-readable error codes These are constants to indicate the error that happened. Add as much information as you can think of to make is as easy as possible to integrate with your API.

Web Api Error Handling

In practice, it's usually sufficient to specify exceptions that are logically part of the interface and which a client may want to catch and do something about. This Site Nov 15 '15 at 21:15 +1 for the concept of REST police. Api Error Handling Best Practices You can include a rest, xml, or plaintext message as the payload that includes a sub-code and a descriptive comment. Rest Api Error Handling An app can consume the error codes (e.g., in a switch statement) to display dialogs that are relevant to the error condition.

For example, assume you try to set expiration and permissions (both of which are not permitted) on a shared link that is accessible to collaborators only, the error response would be: http://dis-lb.net/error-handling/asp-net-404-error-handling.php When building your SDK you should try to keep it as decoupled from your API as possible, relying on dynamic responses and calls while also following the best coding practices for Are HTTP brute force attacks a thing nowadays Can Infrared Thermometer (IR Gun) be used to measure the ambient room temperature? This tells the client that the request was OK, but that it failed (something a 200 doesn't do). Rails Api Error Handling

You can still catch them farther up, or not, depending on needs. –sleske May 7 '12 at 8:48 add a comment| up vote -1 down vote Right-biased Either. And what are those error codes and sub-codes? Connect with us Sign up for our newsletter current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. this content I have also heard that checked exceptions were a big hurdle when they were trying to add anonymous functions to the language. –hugomg May 7 '12 at 15:01 @missingno:

Design 2. Error Handling Design Pattern The specific status that's used is honing in on only one specific aspect of the question. –Manachi Feb 26 '15 at 0:04 | show 5 more comments up vote 84 down In this post you've learned one way to design error handling for a REST API and how you could implement it with Jersey.  I'd more than happy to hear about your approach

Browse other questions tagged design language-agnostic error-handling or ask your own question.

For example, the Google GData API uses only 10 status codes, Netflix uses 9, and Digg, only 8. Such cases should be documented in the interface specification. What is the current (or soon to be) state of the art for error handling that meets the requirements of best practices as outlined above, but doesn't rely on calling code Rest Error Handling Example If you need more, add them.

share|improve this answer answered May 3 '12 at 22:40 CodeART 3,06011017 add a comment| up vote 1 down vote Leaky abstraction Why should an interface specify which exceptions can be thrown? The solution to your design problem is to have two interface/abstraction implementations. Links to the next or previous page should be provided in the HTTP header link as well. have a peek at these guys You can never silently ignore an exception, but people can and do silently ignore return codes- definitely a bad thing.

share|improve this answer answered May 3 '12 at 11:28 vski 960410 add a comment| up vote 1 down vote Favour exceptions over error codes Both should coexist. So for security related information: usernames/passwords/API keys - I would err on the side of being vague rather than specific for anything that has sensitive information. Upcoming improvements to Box API V2's error responses For the past few months, I have been working on improving the error responses that the Box API V2 returns for client-side errors. Fork me on GitHub CodingpediaOrg Feed Categories C# Java EE Podcastpedia.org WordPress architecture code database dev tools development errors hibernate ide image intro java java ee javascript jekyll optimization qa resources

It's not nearly as simple as your first best practice item suggests. If it's simply the wrong hostname, rather than an invalid one, however... With the help of the AppExceptionMapper: package org.codingpedia.demo.rest.errorhandling; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.Response; import javax.ws.rs.ext.ExceptionMapper; public class AppExceptionMapper implements ExceptionMapper { public Response toResponse(AppException ex) { return Response.status(ex.getStatus()) .entity(new ErrorMessage(ex)) .type(MediaType.APPLICATION_JSON). Document...

Use plural nouns Do not mix up singular and plural nouns. The exact error should be explained in the error payload. Anatomy of an Open API Initiative 10821 Why APIs? Will You? 30116 Kubernetes Authentication for the Enterprise 29786 Apigee API Management Available for Apps in AWS Ma... 29831 Ticketmaster Brings the DevJam to San Jose! 29706 Why Apigee Auto-Scaling Matters

Some folks read through pages and pages of documentation before starting, but others are more comfortable jumping in feet first and seeing what works. Best of both worlds :-). –sleske May 7 '12 at 8:13 And BTW, that is just what java.lang.SQLException does. Please join the API Craft conversation on Google groups. Error responses are extremely important to get right — they determine whether developers keep building on your API or get so frustrated with cryptic error responses that they abandon the API.

Application errors and HTTP errors. To quote their documentation: If the error occurs during thecopyoperation, the error response is embedded in the200 OK response.