For HTTP get requests, the parameter is embedded into the URL as part of the query string.For HTTP post requests, the parameters are embedded into the body of the request.These parameters have the form of key=value, and their integration into the request depends on the request method. These parameters have the form of key=value and are embedded into the HTTP header of the request. The TRESTRequest component supports several different types of parameters, all of which have their own usage pattern. Typically, a request contains parameters such as the following: The request also defines the HTTP methods ('get', 'post', 'put', 'delete') that are used for its execution.
#Exemplo rest delphi full
This value forms the previously mentioned 'second half' of the full request-url and defines the actual action that is executed on the service. One of the most important properties of the request is the 'Resource'. When connected to a client-component, it can be executed (even at design time). The request ( ) holds all parameters and settings that form the actual HTTP request to the service. This allows it to leverage the OS's ability to automatically resolve and deal with SSL/TLS/HTTPS. The framework operates on the newer TNetHTTPClient, which is based on system HTTP client sockets. The client only throws 'hard' exceptions, connection failures, and so on. TRESTClient is built to hide any HTTP-related exceptions as long as the exception can be represented by a standard HTTP code. The documentation of the service-provider typically contains information about the url-structure. The 'second half' is the 'resource', and it is provided by the request-component. All requests are directed to this endpoint, so the base-url is the 'first half' of the complete request-url. The base-url is the primary endpoint of a service-provider and typically remains constant for all requests to this provider.
One of the most important properties of the client is the BaseURL. Authenticators (described later) can be attached to the client for a convenient way of adding authentication to a request. TRESTClient manages the HTTP connection to the service, deals with HTTP headers and proxy servers, and receives the response data. is the component that actually executes a request to a service. All of them are part of the workflow when fetching data from a service. The concept of the REST components is built around a troika of three main components: the request, the client, and the response. REpresentational State Transfer - as defined by Roy Fielding, 2000Īn instance of the TRESTRequest componentĪn instance of the TRESTResponse component The framework focuses on JSON as the representation format. The library is available for all platforms that are supported by Delphi. The Embarcadero REST Library is a framework for accessing REST-based web services (REST stands for Representational State Transfer). 5.4.4 Transforming a Response into a DataSet.5.4.1 Prerequisite: Registering an Application.
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