Spring http client4/19/2023 ![]() ![]() The Spring approach to HTTP Remoting allows clients to communicate with the Spring-hosted server code via HTTP without the client code requiring any knowledge of HTTP being used. There are numerous online resources on this subject, so my intention here is to provide an extremely simple but complete demonstration of using Spring's HTTP Remoting with non-browser clients. In addition, we can verify that our code under test called the correct mocked service: mockServer.I am using this blog entry to demonstrate by simple example the use of the Spring Framework's HTTP Remoting. Now that we have the mocked responses in place and a running mock server, we can call our service: BooksClient booksClient = new BooksClient(WebClient.builder()īooksService booksService = booksClient.getBooksService() withContentType(MediaType.APPLICATION_JSON) In case we want to avoid mocking the WebClient, we can use a library like MockServer to generate and return fixed HTTP responses: new MockServerClient(SERVER_ADDRESS, serverPort) We can also use any other async or reactive types registered in the ReactiveAdapterRegistry. Mono>: performs the request, releases the response content, and returns a ResponseEntity containing status, headers, and the decoded response body stream.ResponseEntity, Mono>: performs the request, releases the response content, and returns a ResponseEntity containing status, headers, and the decoded body.ResponseEntity, Mono>: performs the request, releases the response content, and returns a ResponseEntity containing status and headers., Flux: performs the request and decodes the response content to a stream of the declared type., Mono: performs the request and decodes the response content to the declared type.HttpHeaders, Mono: performs the request, releases the response content, and returns the response headers.void, Mono: performs the request and releases the response content.To summarize, HTTP interface exchange methods support the following set of return values: As well as returning void in case we are not interested in the service response at all. ![]() In addition, we may choose to return only the specific response information, such as status codes or headers. However, declarative HTTP interface exchange methods support both blocking and reactive return values. We should note that request parameters are encoded in the request body only for content type “application/x-In our example interface, the exchange methods return blocking values.
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