11/23/2023 0 Comments Jalbum java error![]() ![]() Thankfully Web API also supports Action based routing which allows you create RPC style endpoints fairly easily: ( HTTP Verb routing is limited to the few HTTP verbs available (plus separate method signatures) and - worse than that - you can't easily extend the controller with custom routes or action routing beyond that. This works great for resource APIs but doesn't work so well when you have many operational methods in a single controller. Verb based routing essentially maps a controller and then uses HTTP verbs to map the methods that are called in response to HTTP requests. If you've looked at Web API demos you've probably seen a bunch of examples of how to create HTTP Verb based routing endpoints. RPC works well out of the box, but there are some differences especially if you're coming from ASP.NET AJAX service or WCF Rest when it comes to multiple parameters. ![]() In any case Web API does a good job of providing both RPC abstraction as well as the HTTP Verb/REST abstraction. Proper REST has its place - for 'real' API scenarios that manage and publish/share resources, but for more transactional operations RPC seems a better choice and much easier to implement than trying to shoehorn a boatload of endpoint methods into a few HTTP verbs. It might not be what the cool kids do, but I don't see RPC calls getting replaced by proper REST APIs any time soon. ![]() Web applications that have needs for things like live validation against data, filling data based on user inputs, handling small UI updates often don't lend themselves very well to limited HTTP verb usage. RPC might not be considered 'cool' anymore, but for typical private AJAX backend operations of a Web site I'd wager that a large percentage of use cases of Web API will fall towards RPC style calls rather than 'proper' REST style APIs. verbs to implicitly determine what operation needs to be fired. Typically RPC calls - like SOAP calls - tend to always be POST operations rather than following HTTP conventions and using the GET/POST/PUT/DELETE etc. Rather than mapping explicit server side resources or 'nouns' RPC calls tend simply map a server side operation, passing in parameters and receiving a typed result where parameters and result values are marshaled over HTTP. RPC style HTTP calls mimic calling a method with parameters and returning a result. But RPC style calls that are common with AJAX callbacks in Web applications, have gotten a lot less focus and there are a few scenarios that are not that obvious, especially if you're expecting Web API to provide functionality similar to ASP.NET AJAX style AJAX callbacks. While Web API provides many new features and makes many scenarios much easier, a lot of the focus has been on making it easier to build REST compliant APIs that are focused on resource based solutions and HTTP verbs. Web API addresses many of the concerns that developers had with these older APIs, namely that it was very difficult to build consistent REST style resource APIs easily. This new API provides a host of new great functionality that unifies many of the features of many of the various AJAX/REST APIs that Microsoft created before it - ASP.NET AJAX, WCF REST specifically - and combines them into a whole more consistent API. The best way I have found to get a feel for things like this is to try them out: import java.io.ASP.NET Web API introduces a new API for creating REST APIs and making AJAX callbacks to the server. While both paths refer to the same location, the output will be quite different: C:\Windows (Paths.get(absolute_path_string).getParent()) (Paths.get(canonical_path_string).getParent()) String absolute_path_string = "C:\\Windows\\System32\\drivers\\.\\" \ and resolving symlinks (on unixes).Īlso note the following example with nio.Paths: String canonical_path_string = "C:\\Windows\\System32\\" The canonical path of a file just "purifies" the path, removing and resolving stuff like. It's not a canonical path.Ī canonical path is always an absolute path.Ĭonverting from a path to a canonical path makes it absolute (usually tack on the current working directory so e.g./file.txt becomes c:/temp/file.txt). It's neither an absolute path nor a canonical path.Ĭ:\temp\myapp\bin\.\\.\file.txt - This is a path and an absolute path. C:\temp\file.txt - This is a path, an absolute path, and a canonical path.
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