just( "TraceId: " . 4 via Java Config. With the annotated controllers; you can return an ResponseEntity<Flux<T>> and set the headers: value = "text") String text) {. Feb 19, 2021 · My first idea was to use a MockMvc object but then I read about the WebTestClient provided by Spring. Jun 23, 2019 · When using the WebClient within a Spring Boot project, we can inject the auto-configured WebClient. 0_181 Header: localhost:8000 Header: http Header: 8000 Header: 172. It will automatically append the access token in all the calls made by your WebClient. Spring Framework has built in support for setting a Bearer token. AUTHORIZATION such that you do not need to define by your own : HttpHeaders headers = sendPost. Aug 7, 2018 · return (clientRequest, next) -> {. You can do this by creating your own Encoder (wrapping the existing Jackson2JsonEncoder for example) and passing this as an ExchangeStrategies when building the WebClient. flatMap(response -> { return response. getConnection May 11, 2024 · Note: although it might seem we reuse the request spec variables (WebClient. setBearerAuth(token); Mar 2, 2020 · Hence, when the webclient retries the unauthorized request, it can obtain a new token and set it on the header before performing the retry. To use WebClient api, we must have the spring-boot-starter-webflux module imported into our Spring Boot May 20, 2015 · Spring: 3. Mar 17, 2024 · 1. fun httpClient(): HttpClient =. 6. 178. This is my initial attempt: @SpringBootTest(webEnvironment = SpringBootTest. Any attempt to set one of these restricted headers in the This guide shows how to configure OpenID Connect Dynamic Client Registration in Spring Authorization Server and walks through an example of how to register a client. It also allows the use of WebClient in all its non-blocking glory. header("Authorization", "Bearer " + this. I have an HttpClient that I am using for a REST API. 8. It is fully non-blocking, it supports streaming, and relies on the same codecs that May 8, 2018 · I am new to Spring Reactive framework & trying to convert Springboot 1. getContext(). Jul 10, 2019 · It is not possible with retrieve. We can avoid adding a new dependency in the project by adding RestClient. 👍 3. AUTHORIZATION, auth. It is very common these days to use HMAC-based Authorization schemes, whereby the parts of the request are signed using a secret key and the signature Jan 8, 2024 · The helper class ExchangeFilterFunctions offers the basicAuthentication() filter function which takes care of adding the authorization header to the request. The API I am working with has a non-standard required header as part of the token request. class). logger. Within an application that uses the WebClient class to make requests to an API which requires an Authorization header, after upgrading the application libraries from Spring Boot 2. Applications typically would not set this header directly but rather prepare a MultiValueMap<String, Object>, containing an Object or a Resource for each part, and then pass that to the RestTemplate or WebClient. build(); 6. x code into Springboot 2. The flow is working up until step 4. This annotation allows for a variety of scheduling options, including CRON-style scheduling. I need to return response header after some filtering, body & status code from Spring 5 WebClient ClientResponse. 1. ExchangeFunctions=TRACE. May 14, 2019 · There are multiple ways of specifying custom headers. The Spring WebClient is part of the Spring’s reactive web module that aims for building reactive and non-blocking applications. . from(request). The filter allows easy access to both requests and responses. return next. The Authentication API is in json but the subsequent call is in XML. return (request, next) -> next. UriSpec, WebClient. I need to fetch the auth token and set it in the header. AUTHORIZATION, "Bearer Apr 10, 2019 · These applications are called with a set of headers, some of which (Open Tracing) I need to propagate in downstream calls using WebClient. Mar 17, 2022 · This access token is appended in the header when you make the actual call to the protected resource. These are the webclient codes, and It works well. setX(""); httpHeaders. Spring Security 5. Spring OAuth: 1. Secondly, are they expecting the header to be Base64 Encoded - this is normally required for basic authentication. I thought springboot can do it transparently. Click on Import. user. The flow is simple, I need to get a token from some endpoint and set it to authorization header. RELEASE to check the anonymity level of proxy servers. May 11, 2024 · return new ResponseEntity <String>(String. build(); edited Jun 17, 2020 at 17:13. exchange(clientRequest); }; I understand that this may be the equivalent of ClientHttpRequestInterceptor in a certain sense, but it doesn't give you very much access. RELEASE to 2. The application successfully makes Oauth authentication request, receives a token and posts the Jul 28, 2020 · So you can create an anonymous class implementing the Consumer interface or use lambda expression like this: Using anonymous inner class: this. Conclusion Jun 8, 2022 · I'm trying to create a resilient sse (server sent event) client in reactive programming. To get this token you need to make a call to the authorization server. Mar 29, 2024 · The standard WebClient from Spring Framework doesn’t provide any ready to use instrument to prevent multiple simultaneous requests against upstream resource. So for starters I suggest try to merge those 5 headers in 1. defaultHeaders(headers -> headers. The Headers property contains a WebHeaderCollection instance containing protocol headers that the WebClient sends with the request. Solution/example: import org. This is how the implementation looks up till now: Jan 13, 2018 · Guy Smorodinsky's answer is ok but for example for Spring you might want to override some additional methods, like Enumeration<String> getHeaders(String name), as Spring uses this while getting header value with @RequestHeader annotation. Sep 24, 2020 · If you’ve ever been looking for a client to perform HTTP requests in your Spring Boot application you’ve probably run into the RestTemplate or reactive WebClient. Flux<SearchResult> results = searchService(). url()); return next. Spring Authorization Server implements the OpenID Connect Dynamic Client Registration 1. Overview. Jan 10, 2024 · 1. RANDOM_PORT) @AutoConfigureWebTestClient. The colon character is important here. How to customize the Authorization header of the OAuth2 token request using spring-security-oauth2 with a WebClient? 5 WebClient with ClientRegistrationId as request attribute (using OAuth 2. headers(h -> h. password=admin When I startup this service and access like this: Jul 16, 2020 · 本文主要介绍了两种WebClient的Basic Auth使用姿势，其原理都是基于设置请求头的方式来实现的. However, by default, this will still show headers as {headers masked} (as they Jan 19, 2024 · In this article, we will discuss how to handle 401 errors and refresh access tokens using Spring WebClient. HTTP Interface - annotated interface with generated, dynamic proxy implementation. Mar 16, 2022 · Right now I am using BasicAuthenticationInterceptor to add basic auth credentials to the Http 'Authorization' headers. map(myResponse -> { List<String> headers = response. Use WebClient for real, but mock the service it calls by using MockWebServer (okhttp) 3. The sse endpoint is authenticated, therefore I have to add an authorization header to each request. I am able to get responsebody pretty easily using bodyToMono. Basic Authentication. map(SecurityContext::getAuthentication) . oauth2. You can achieve the same result of having Authorization header set up with less custom coding. filter(ExchangeFilterFunctions. In this case token will be updated Dec 10, 2009 · The problem is that the request is not authenticated so all I get is a login screen. You can set these per request or globally during WebClient creation. The end goal is to construct a WebClient to interact with the OAuth protected API. Your "get first value" logic is already provided by HttpHeaders#getFirst() . 153:9001 Header: Keep-Alive As you can see there is no Authorization header. setY(""); You should use Mono. My new requirement asks to add another Http 'Authorization' header with a OAuth/JWT token. RequestHeadersSpec, WebClient. However, you can't access the body. Encoding = Encoding. re-use the same token for subsequent requests for the duration of the token validity. 3. concat(traceId)); Then, we intercept the server web request and add a new header, traceId, using the TraceWebFilter implementation: Looks like there are some weird restrictions on the "Content-Type" header with the WebClient class. The following documentation is for use within Reactive environments. 0 specification, providing the capability to dynamically register and retrieve OpenID Oct 29, 2020 · var recommendations = ((XYZResponseMapper) responseMapper). Download methods (DownloadData, DownloadFile, etc) See if using the "UploadFile" method on webclient works rather than doing it manually. Mar 30, 2016 · 1. Text. Add(HttpRequestHeader. I have separa Jan 24, 2020 · Here is the gist: Digest Auth in Spring WebClient. filter((request, next) -> {. Feb 17, 2022 · WebClient filter to add Authentication header. format( "%d * 2 = %d", myNumber, (myNumber * 2 )), HttpStatus. WebEnvironment. Feb 23, 2023 · Unlike RestTemplate, WebClient is asynchronous and non-blocking. UTF8; webClient. web. 1 application with OAuth2 Client functionality. basicAuthentication，通过filter来处理请求头; II. All at Once. 5. In HTTP GET method, http basic authentication works successfully. 0) Jan 24, 2013 · Firstly, there is a handy constant HttpRequestHeader. Please see code snippet below from spring docs: WebClient. logging. company. Since Spring 5 (and Spring 6), the WebClient is the recommended approach for sending HTTP requests. RELEASE, the client fails to send headers which are set by . client. org. builder() . springframework. Feb 26, 2019 · I'm using the Spring WebClient from spring-boot-starter-webflux 2. level. accept(MediaType. UTF8 Dec 2, 2019 · 51. exchange(); Header and Cookie Management: WebClient allows you to manipulate headers and cookies for each request easily. yml: spring: security: Auth1 header is just 1 header and not multiple. js http server through some proxy servers, there are no proxy related HTTP headers in my requests. var entity = new ResponseEntity<>(recommendations, nullHeaders, HttpStatus. 26. 其他 0. Authorization = new Credential(OAuth. setY(""); This doesn't save much typing; so for the headers that don't change from one request to another, you can set those as default headers while building the client: httpHeaders. Locate the Baeldung tutorials folder and its subfolder spring-security-x509/keystore. client, class: ServerOAuth2AuthorizedClientExchangeFilterFunction Jun 25, 2024 · A WebFilter acts globally and, once enabled, intercepts all requests and responses. This call will be made automatically by Spring. The authorization token expires after 1 hour. 2. Generally, a filter is used to intercept and analyze a client request. Add support for Digest Auth to RestClient wultra/lime-java-core#162. NET that suggests the following, httpClient. public class UserControllerIT {. filter与ExchangeFilterFunctions. com. empty(). We can find further information about this framework in previous posts . First, we should define the annotation-based controller: return Mono. Choose “ Trust this CA to identify websites” and click OK. baseUrl(someConfiguration. APPLICATION_JSON). In this tutorial, we’ll see how to customize request parameters and response handling. 3 and Spring Security 5. I'm using spring webflux webclient for an external api service. but i do not like to fetch this access token in every call of other secured endpoints. log-request-details=true. Closed. Thanks. getApiUrl()) . Mar 3, 2020 · I try to use WebClient with oauth2 in spring webflux. Clients can authenticate via username and password. I have everything working, however, when I request a restricted resource from the resouce server, I have to provide the access_token as a query paramater. According to the official documentation RestTemplate class is in the maintenance mode since Spring 5 and we should consider using WebClient which is a part of the Spring WebFlux May 10, 2021 · I am new to spring webclient and i have written a generic method which can be used to consume rest apis in my application: public <T> List<T> get(URI url, Class<T> responseType) { Nov 3, 2021 · The retry spec will check if the exception was of the HttpClientLoginException type, thrown when the request gets a 4xx status code and in that case it will try to login again and set the header for the next retry. baseUrl(baseUrl) . properties: spring. DefaultRequestHeaders. if we send a request the Principal is passed automatically if there is an authenticated user. Maven. Dec 17, 2019 · Signing the body would require it in serialized form, but serialization happens just before sending the data so it needs to be intercepted. webClient. Make sure to add it to the webclient: webclientbuilder. authentication and authorization) your HTTP API. Jan 3, 2019 · Yes. basicAuthentication(user, password)) . Some common headers are considered restricted and are protected by the system and cannot be set or changed in a WebHeaderCollection object. Sep 22, 2021 · I would like to receive the headers (especially the content-type) from the webclient response. May 11, 2024 · In this quick tutorial, we’ll explore the different ways of setting a header on a service response, either for non-reactive endpoints or APIs, using Spring 5’s WebFlux framework. A custom filter for the WebClient may look like the following: private ExchangeFilterFunction authHeader(String token) {. WebClient is a non-blocking, reactive HTTP client with a fluent functional style API. getConnection(); connection. Jul 5, 2019 · Spring provides API for supplying basic authentication parameters to your WebClient via ClientFilters. I have the following application. org. AUTHORIZATION); Dec 25, 2023 · It’s fairly straightforward for us to create the Authorization header for Basic Authentication, so we can do it manually with a few lines of code: HttpHeaders createHeaders(String username, String password) {. Sep 21, 2016 · To protected this url, I config spring-security like this: management. Jun 13, 2023 · In Spring WebClient, you can set multiple headers at once using the header() method in conjunction with the headers() method. 0. Ex. In Spring, we can intercept a request, for example, with HandlerInterceptor. banterCZ mentioned this issue on Feb 7, 2023. http Jun 24, 2017 · When using spring integration 3 and spring integration-ws, the following code can be used for handling the request: public boolean handleRequest(MessageContext messageContext) throws WebServiceClientException { TransportContext context = TransportContextHolder. Similarly, the Web Client is used for making non-blocking reactive HTTP requests to other services. 3 days ago · Type about:preferences in the address bar. token); Jun 1, 2022 · Spring boot WebClient In this article, we will take a deep dive into Spring boot WebClient and how to send HTTP requests and get response using it with examples. These directives shouldn’t be reused for different requests, they retrieve references, and therefore the latter Jan 7, 2021 · There is a specific issue with Spring Security and Spring WebFlux's WebClient in general, where it is not that easy to understand how to pass the authentication from the Spring Framework MVC controller directly into WebClient, if the project does not use OAuth2Authentication, and when the Spring Security is configured so that the endpoints must require authority (ROLE_ etc. ASCII. NOTE: In my case I only wanted OAuth to protect a single path (/oauth/**) so if you want it protecting everything then you may be able to simplify some parts of this. header(HttpHeaders. Here's a piece of code that configures my web client: Jan 8, 2024 · 2. Jan 8, 2024 · 2. bclozel mentioned this issue on Apr 24, 2023. I do not want to use block() method as it will convert it into sync call. WebClient has a functional, fluent API based on Reactor, see Reactive Libraries , which enables declarative composition of asynchronous logic without the need to deal with threads or concurrency. 1 provides support for customizing OAuth2 authorization and token requests. 3 Adding new header when retrying with Spring WebClient. Authentication and Authorization: It supports various authentication mechanisms like Basic Auth, Bearer Token, and more sophisticated OAuth2 client credentials. I'm new to Spring boot and reactive programming. builder(). This auto-configured builder customizes the WebClient to, among other things, emit metrics about the HTTP response code and response time when the Spring Boot Actuator is on the classpath: Java. If those headers change on a per request basis, you can use: httpHeaders. Nov 1, 2022 · With that being done, let’s finally do something to follow the 301 response in our WebClient. getUserId()). someWebClient = WebClient. enabled=true security. 0 or JWT authentication. WebClient - non-blocking, reactive client with fluent API. Below are the topics covered 1. I use http basic authentication. create() . I have tried a couple methods and settled on adding a Filter to the WebAPI as suggested here WebAPI Authentication Filter. I found this code with flatmap-mono-getHeaders, but it doesn't work. 7. You need to use the exchange function instead of retrieve,. When a request is made using WebClient, the thread that initiates the request continues its life without being blocked, thus providing an asynchronous structure. As a result, we don’t need to define a filter for it: WebClient webClient = WebClient. 项目. For example, you can't see the body of the request. Spring WebFlux includes a client to perform HTTP requests with. We will cover the following key concepts: Setting up a Spring WebClient with an authentication header; Handling 401 errors and refreshing Oct 3, 2018 · 2. uri(host) . Nov 8, 2019 · 11. Exactly what I needed. Instead of using a filter, I'd recommend utilising the standard loggers by adding these lines to your resources/application. Similar to Spring WebFlux, it enables reactive programming, and is based on an event-driven structure. I've created a client and made successful calls to an external web-service GET endpoint that returns some JSON data. UnsupportedMediaTypeException: Content type 'image/tiff' not supported for bodyType=org. JSON Web Token (JWT) is a JSON-based open standard (RFC 7519) for creating access tokens that assert some number of claims. If we’re not sure which headers will be present, or we need more of them than we want in our method’s signature, we can use the @RequestHeader annotation without a specific name. headers((headers) -> {. It begins with the Basic keyword, followed by a base64-encoded value of username:password. I would prefer to provide this as an HTTP header. I need to set the header to the token I received from doing my OAuth request. Apr 18, 2022 · The best way would be to use ServerOAuth2AuthorizedClientExchangeFilterFunction that you could customize to satisfy your needs. exchange(request) . info("External Request to {}", clientRequest. title}") String serviceTitle, @Value("${openapi. We wrote an interceptor that, whenever an external API is called, is triggered and complements the request with an API token. Builder and create the instance using this builder. Jan 16, 2021 · I've been learning Spring Webflux and reactive programming and have gotten stuck on a problem I'm trying to solve around retry logic using Spring Webclient. ReactiveSecurityContextHolder. 2. This is a common scenario when building secure REST APIs with OAuth 2. Below is a portion of my code: WebClient webClient = new WebClient(); webClient. String auth = username + ":" + password; May 11, 2024 · In just a moment, we’ll figure out how to build and send each type of URI with WebClient. FYI: Since this is to be a file-upload tool I would prefer the data only be sent once, as the files Nov 28, 2018 · Header: application/json Header: Java/1. followRedirect(boolean) variant: @Bean. 0 working in spring-boot 1. ok() Mar 12, 2021 · 1. header("session-id"); // here you build your new object with the response // and your header and return it. I've found great help in callicoder. security. Apparently spring oauth2 client isn't sending the Authorization header when invoking user-info-uri. For Servlet environments, refer to WebClient for Servlet environments. flatMap((Function<ClientResponse, Mono<ClientResponse>>) clientResponse -> {. ). For example: Nov 20, 2023 · RestTemplate, added in Spring 3, is a bloated class exposing every capability of HTTP in a template-like class with too many overloaded methods. ASCIIEncoding. filter(retryOn401()) . clientConnector(buildTimeoutConnector()) . Here is the command to download the starter for the WebClient-based client from the Spring Initializr. WebClient. It is part of Spring WebFlux module that was introduced in Spring 5. However I don't yet understand how I would be able to mock the JWT token. If these were normal Spring WebMvc applications I would use a Filter to keep the selected headers in a ThreadLocal, access it in a RestTemplate interceptor to send them to subsequent services and clear the Jun 13, 2023 · Client Request Filter. setBearerAuth(token)) Spring Security builds on this support to provide additional benefits: In this tutorial, we will see how to create a Spring Boot application that sets up WebClient to consume the /greeting endpoint of a REST API secured with Basic Authentication. Using Mockito. defaultHeaders(new Consumer<HttpHeaders>() {. Security: 3. I'm struggling to customize a Spring Boot 3. syncBody(req) . Select the rootCA. Is there a reason you aren't just flatmapping the Authentication and then calling the webclient? You could also just return the Mono<String> from your method. After I made some requests with the WebClient to a custom node. Basic authentication is a simple authentication method. 1. e. apiKey). Set the Content-Disposition header when creating a "multipart/form-data" request. For example, below code would set JWT bearer token in the Authorization header. GetBytes("12345678901234567890"))); Sep 14, 2023 · Before Spring 5, RestTemplate has been the primary technique for client-side HTTP accesses, which is part of the Spring MVC project. @Bean. defaultHeader来手动设置默认请求头; 基于WebClient. UseDefaultCredentials = true; return Encoding. It was introduced in Spring 5 as part of the reactive stack web framework and is Sep 8, 2019 · The aim of this article is to demonstrate how to add a Custom Authorization Header to requests made by a Spring WebClient, which has replaced RestTemplate as the recommended Spring HTTP client. exchange(ClientRequest. baseUrl(url) . If the status code was different it will retry again using the same authorization. http. The key is to add a filter in the WebClient. May 1, 2021 · Hi @Codemaster Your response is much appreciated. But there are business cases where Jun 15, 2018 · You could look at implementing your own client support by implementing a org. Jul 9, 2018 · In the functional API, this is really easy; the ServerResponse builder has builders for almost everything you need. For both requests and responses, you can access method, URL, headers and other things. WebClient introduction 2. Sep 21, 2023 · post the processed data together with the token using WebClient to a third party API that uses Oauth2 for authentication. 2 How to use Spring WebClient to make a subsequent call with May 14, 2020 · RestTemplate 의 대안으로 Spring 에서는 WebClient 사용을 강력히 권고하고 있으며 . Headers. Alternatively (and because rolling your own support might be difficult), you could create a new issue on the Spring Security project and see of the community is interested in such a feature. Authorization. what you are saying is absolutely right. 3 that is obtaining JWT tokens from an authorization server through authorization code grant type and calls a protected resource server. I have sent the UseDefaultCredentials property to true but I still get the same result. 20. Please note that the URIs for gettings products by tags and categories contain arrays as query parameters; however, the syntax differs because there’s no strict definition of how arrays should be represented in URIs . 系列博文 May 30, 2020 · For Authorization header to work, it is also required to have security in the root of the specification. These credentials are sent in the Authorization HTTP header in a specific format. headers(). Means that i want to fetch it only in the first time during the instanciation of the webclient and when the access token expire. ToBase64String(System. ExchangeFunction. The external API we use requires authorization followed by substitution of a token in the Authorization header of the request. service. As the first one, let’s start with the. post(). name=admin security. Furthermore , Authorization header field name is also provided by HttpHeaders. Then, it will propagate that token in the Authorization header. Here's an example: WebClient webClient = WebClient. Oct 25, 2023 · But we have no need for a reactive approach, so we decided to use webclient in synchronous mode. Nov 16, 2016 · Here is how I got 0-legged OAuth 1. mapReactive(request, response, useCaseId, variantName); //return type Recommendations. exchange() . If the headers are static, you can specify them during WebClient instance creation using defaultHeader or defaultHeaders methods: I need to call an third party API which requires an authentication call beforehand to get an authentication token. 168. getFirst(HttpHeaders. flatMap(auth -> webClient. 1 Header: gzip Header: 0 Header: 192. headers. In this article, you'll learn how to use WebClient and WebTestClient to consume and test REST APIs. However I am having trouble setting up the Authorization header. We have two main options for mocking in our tests: Use Mockito to mimic the behavior of WebClient. function. The key is "Authorization" and the value are the rest which is called authorization string. For example, an HTTP request can be intercepted to view headers, parameters, or it can be intercepted to add authorization, logging, or anything you need in a request. The WebClient also supports synchronous HTTP access, but it required an additional dependency spring-boot-starter-webflux. public OpenAPI customOpenAPI(@Value("${openapi. Using a PowerShell Cmdlet encapsulating a WebClient call to a WebAPI, I am attempting to implement Basic Authentication. reactive. Jul 8, 2019 · And also make the webflux client codes with WebClient class. 基于WebClient. OK); // Here you are suddenly creating a new mono, which tells me you deffo broke the chain and need to recreate it by doing May 15, 2019 · 3. getTransportContext(); HttpUrlConnection connection = (HttpUrlConnection) context . When the above WebClient is used to perform requests, Spring Security will look up the current Authentication and extract any AbstractOAuth2Token credential. followRedirect(true) The only thing we have to do in this case is to pass the true to the. bodyToMono(MyResponse. I saw some code for . [ source] This time, I want to share my experience on how to secure your HTTP API in Spring Webflux using JWT, at least as far as I Oct 15, 2019 · Using Webflux filter, I am trying to intercept the requests and check if the request is coming from certain URI then add a new Authorization header. 1 Spring. OK); } Copy. Mockito is the most common mocking library for Java. create(); // Create Jul 22, 2018 · JWT is one of the ways for securing (i. The filter code is simple and straightforward Aug 31, 2017 · The question is about debugging WebClient POST. RequestBodySpec, WebClient. Also we understood that the WebClient is going to replace RestTemplate which is one of the most popular Web Clients. Open Advanced -> Certificates -> View Certificates -> Authorities. addAll(requestHeader)) . Look in to using the client. Jan 31, 2013 · 837. @Override. Sometimes OAuth2 APIs can diverge a little from the standard, in which case we need to do some customizations to the standard OAuth2 requests. Jul 28, 2021 · It's necessary to use the 'clientConnector' to set proxy settings and then add a proxy authorization into headers. return new HttpHeaders () {{. We will also learn how to set request headers and configure timeouts. find(text); return ResponseEntity. Below is a snippet of my code Jan 6, 2020 · It fetches OAuth2 tokens in a background thread regularly for you and you can pass it to your WebClient. post() . MyResponse May 5, 2021 · Second, you will use WebClient to make requests using the @Scheduled annotation. version}") String serviceVersion) {. I fetch a token from an url access token and i set it into the webclient. ResponseSpec), this is just for simplicity to present different approaches. Authorization, "Basic " + Convert. crt file and click OK. if declaration: package: org. RestTemplate - synchronous client with template method API. Mocking. getHeaders(); String value = headers. HttpClient. Spring's WebClient is a modern, non-blocking, and reactive client for HTTP requests. The Spring Framework provides the following choices for making calls to REST endpoints: RestClient - synchronous client with a fluent API. I'm implementing an OAuth2 web application Client using Spring Boot 2. Nov 13, 2020 · I have been struggling for 2 days already to get Spring WebClient authenticate my service against a (presumably) OAuth2 endpoint. mtmlizhtcfjultpmndfl