![]() In case of Trello’s API, there is no need to provide neither of the headers above, cause Trello supports only JSON format and will always return objects with this format.īut for the input, Trello’s API only works with query string parameters even for write HTTP methods like POST and DELETE. Accept: The output format accepted in the response by the client.Content-Type: The request input format send to the server in the request body.As you can see on this snippet of code, the actual request parameters are passed through the URL and the method inside the options variable. For the other three types (PUT, POST and DELETE) you need to pass the request method as parameter. In REST apis we can specify specific headers to identify input/output format. Unless you specify otherwise, GET requests are the default method in Trello API. Use HTTP headers to specify input/output format It is preferable to use sub-resources rather than main resource as query string. Use sub-resources for relationships between resourcesĪlways when we need to get a resource related to another. Examples:Īlthough there are some URIs not using sub resources in plural. Let the HTTP methods be the verbs when define your REST API.Īnalyzing Trello’s API documentation, there are only nouns used to identify the resources. URI should not use verbs, only nouns, otherwise they will not be resource based. REST Design Principles Use only nouns for a URI The browser caches the user credentials, so server does not need to be aware of user state. With Trello’s api the client needs to provide always its oAuth token and API key, so the server can do the authorization. It is the opposite of Statefull applications that generally persist in internal storage client’s session data, for example. ![]() ![]() The server does not save client state during REST API interaction. I could not find prove that Trello’s has a layered architecture, but as most of modern and hight demand applications it probably contains many applications and web servers that are probably scaled and called depending on user request. In case of Trello web application we can assume that is being done by: ComponentĬlient and Server do not know this internal details, only the interface and message format / protocol they should use in order to communicate each other. REST Restraints Client-Server ArchitectureĪ REST architecture should always separate Server code from Client code. The goal of this article is to analyze a real world RESTful application and explain how it adheres to the 5 REST restraints.įor this example I will going to use Trello’s web-services APIs. Explain REST using Trello Software-Architecture ![]()
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