Feign client multiple headers The query to the other service should inclu Mar 7, 2024 · We added the @EnableFeignClients annotation on our main application (which was required for config processing), which triggered a component scan (and subsequent autowiring) for certain components - read: request interceptors - that were previously used on manual feign clients. My microservices use certain header values to keep track of data so when a FeignClient is used it needs to Nov 22, 2021 · I have a microservice that calls several micro services in cascade, using FeignClient (spring cloud). x application. Therefore I'm using BasicAuthRequestInterceptor Folders and files Repository files navigation spring-feign-clients Showing how to use multiple Feign Clients using different Authorization headers. Jan 22, 2019 · I tried with Rest Template passing http headers and its working as expected but some how it not working with feign client. 0 Trying to use feign builder to build the client. We will also discuss how to pass query parameters, path variables, HTTP headers, and request bodies. Jan 16, 2025 · Feign is a declarative web service client, making it a popular choice for inter-service communication in Spring Boot applications. cloud:spring-cloud-starter-openfeign:4. Many of these problems are random or temporary. Feign Clients are used to simplify HTTP client code in Spring applications, and it's important to structure the client methods correctly to avoid these exceptions. gitconnected. Service B checks the token itself correctly, grants access to the method and tries to perform the request of Service A. Feign, a web service client that simplifies the communication between … Jun 21, 2020 · Requests generated by Feign clients can have configurations, for example how to encode, decode and intercept requests. The HTTP client sending the request to the target Feb 24, 2024 · Spring Boot + Kotlin + Multiple @FeignClient I was developing my API and needed to integrate with a microservice. Client class. I wonder if this annotation's Content-Type is used for both consuming and producing, or just for consuming, or if you can specify different types for both producing and consuming? Aug 31, 2023 · I'm facing similar issue. You need to use the annotation @RequestHeader in one of the parameters and pass the header along with it in the method declared inside Feign Interface. There doesn't seem to be a way to to do this easily as the Feign client expects all headers to be specified using @RequestHeader("name"). Feign is a declarative web service client. I want to propagate all the header values between then, without declare one atribute per header May 22, 2018 · You can also achieve this by adding header to individual methods as follows: @RequestMapping(method = RequestMethod. And curiously, I can't find a way to do that. Since Feign requires all headers to be explicitly specified Feb 23, 2020 · spring-cloud-openfeign adds additional support to use spring-web's annotations for feign clients purely for developer's convenience (look at SpringMvcContract). The path and request parameters are specified using the @Param annotation. Using RestTemplate, this is almost trivial to do. Would it be possible to provide your Feign interface so we can review? Sep 27, 2016 · 2 I've a use case where I need to pass all headers that start with a certain prefix to the feign client. Spring Cloud adds support for Spring MVC annotations and for using the same HttpMessageConverters used by default in Feb 14, 2021 · My approach is to use a RequestInterceptor which injects the current OAuth2 token into the request of the OpenFeign client, by adding an Authorization Bearer header. Jan 27, 2025 · Feign converting the RequestTemplate into a format that the HTTP client can use, including headers, query strings, and serialized body content. 3. RequestInterceptors Zero or more RequestInterceptors may be configured for purposes such as adding Feb 26, 2025 · Via Feign. Jan 8, 2024 · This tutorial contains examples that will help you understand how to work with query parameters and headers when using a Feign client. Jan 29, 2020 · Enable feign clients and define a feign client To enable feign clients, you need to use @EnableFeignClient s annotation in the main class definition. Following is a sample interface I created for this post: Dec 13, 2023 · This client provides an abstraction layer for the HTTP requests required to fetch profile information. Spring Cloud adds support for Spring MVC annotations and for using the same HttpMessageConverters used by default in Oct 22, 2020 · I want to be able to do same thing but there is no Produces or consumes headers in feign client. Fortunately, Spring provides a solution to this problem by allowing you to define multiple Feign clients with different configurations. The Feign client configuration incorporates necessary timeout settings and retry mechanisms to ensure robust communication. The method of feign client looks like this: @Req. Feign versions feign-core: 12. But what if you need to call multiple APIs (like Jira, Slack, Google, …) with different users and authentication methods? This article shows how to set up Basic Authentication for Jira (Zephyr API in particular) and how to use a token for Slack API at the same time. This allows you to add headers, alter parameters, or log requests for better debugging. See lines 179 to 198 of the feign. This could cause busin Sep 7, 2022 · 7 i am using spring boot to call a openfeign client and from the Response of that feign i need to extract some header values. 2 Overriding Feign Defaults A central concept in Spring Cloud’s Feign support is that of the named client. How to pass query parameters? Feign is a declarative web service client. In this setup, the Feign Client sends the JWT in the Authorization header received in the original API call to the underlying system. This friendly link is… Learn how to configure multiple Feign clients with unique interceptors for different purposes in your application to enhance API communication. Normally in a Spring Boot application, we’d use @FeignClient, but we can also use @RequestLine if we don’t want to use the spring-cloud-starter-openfeign dependency. HttpHeaders; RestTem Oct 25, 2019 · I have about 10 microservices all built with Spring boot 2 using Eureka and FeignClients. While Feign simplifies HTTP API calls, handling errors Sep 17, 2024 · Learn how to use OpenFeign and CompletableFuture to parallelize multiple HTTP requests. 0' Then in my feign client inte Dec 29, 2024 · Feign is a declarative HTTP client for Java that simplifies making HTTP requests by providing an easy-to-use interface. If Feign has to compete with RestTemplate, it has to be smarter than it currently 7. just help me wheather we can do that or not! Jul 16, 2020 · The setting of the Content-Type header is Client dependent. I don't want to add the header as @RequestHeader to all methods individually. In this tutorial, we’ll learn how to retry failed calls and make more resilient REST clients. Feign logging documentation As per doc, the below logging levels are available to configure, NONE - No logging (DEFAULT). May 6, 2016 · @WesternGun I have added an example how to use feign client with dynamic header properties Feb 15, 2018 · Feign is a great way to communicate between services and send data like a JSON request body, single header or multiple headers and much more. According to the HTTP specification this is fine but Feb 26, 2025 · Feign is a declarative web service client that works by processing annotations into a templatized request. Spring Cloud Feign provides a powerful way to create HTTP clients by defining Java interfaces. Let’s see the previous example, a translator and a test application. This is my FeignClient : Jun 4, 2022 · In this crisp tutorial, let’s learn how straightforward it is to integrate services using Feign Client. In this article, we Jan 11, 2024 · Feign client is a Java to HTTP client binder. 4 to execute a POST request with an empty body. I'm trying to accomplish a multipart file upload using feign, but I can't seem to find a good example of it anywhere. Looking into response headers from API, which comes throw Proxy I can see there duplicate header “Transfer-Encoding”. 8. Apr 29, 2024 · Client receives header “Transfer-Encoding”: chunked – which is instruction to read the response by chunks, but as the chunk size/ partition size is missing Client unable to read response and throws exception. WebClient로 빨리 바꿔야겠다. When processing the request, I want to use a Feign Client to query another service. Feign is a declarative HTTP client library for Java, and Spring Cloud provides integrations for building cloud-native applications. 2. FeignClient is mostly used to consume Nov 29, 2020 · Learn what a feign client is & how to test Spring Cloud feign clients as part of creating a comprehensive framework for testing RESTful APIs. Nov 29, 2019 · I am currently working on a spring boot project and using feign client. Thus, the actual implementation will be created at runtime. Feign has a very flexible and easy-to-use approach. What if you want to send multiple headers? Just repeat the annotation! Feign is a declarative web service client. Feign was developed… Feign makes writing java http clients easier. Apr 1, 2024 · You can't use the bean way to inject the same interceptor, this will be applied to all the feign, you should be the choice to implement the RequestInterceptor interface to operate. 1. how can i do that. The 'Too Many Body Parameters' exception occurs in Feign Client when a request method is defined with an excessive number of @RequestBody parameters, which can lead to confusion in API calls or processing errors. Now I’ll show you how to customize each request sent via Feign clients, like adding headers to all of them without the need to explicitly define them using Feign interceptors. Dec 11, 2019 · Is there a way to add multiple headers when using Feign Client Asked 5 years, 11 months ago Modified 3 years, 4 months ago Viewed 18k times Jun 18, 2025 · When working with Spring Boot and OpenFeign, it's quite common to add custom headers to outbound HTTP requests — like tracking IDs, authentication tokens, or metadata provided by libraries. body is present, even if the body is empty. By the way, it's logically pointless to set multiple paths when you use Feign. builder () API. But what happens when you want to add multiple interceptors in a clean, reusable, and testable way? This tutorial provides a deep dive into managing request headers when using Feign, a declarative HTTP client in Java. BASIC - Log only the request method and URL and the response status code and execution time. Dec 17, 2018 · After some debugging, I found out, that the Authorization-Header is not passed from Service B to Service A. But what do you mean by Declarative REST Client? It means we need to specify the client specification as an Interface and Spring Boot will take care of the implementation for us. This detailed guide provides step-by-step instructions for setting up and configuring Feign Client to simplify HTTP communication in your Spring Boot applications. We need to pass both to the Feign client. Default#convertAndSend method, there is a section that adds request headers. To use Feign create an interface and annotate it. In such a case, we create clients using the Feign. HEADERS - Log Dec 5, 2016 · I try to call Google API with multiple query string parameters. Oct 3, 2020 · Learn how to use Feign Client in Spring Boot. Spring Cloud adds support for Spring MVC annotations and for using the same HttpMessageConverters used by default in Jul 23, 2025 · FeignClient also known as Spring Cloud OpenFeign is a Declarative REST Client in Spring Boot Web Application. Let’s build a proxy interface containing a file upload method targeted to the REST API for the file upload: public interface UploadResource { Nov 23, 2020 · Spring Boot application that is using OpenFeign client to connect to a 3rd party REST API is a well-known approach. Apr 10, 2025 · Customizing Feign Clients with Interceptors and Configuration As a developer working with microservices, you understand that effective communication is vital for system performance and reliability. I couldn't find anywhere in the Feign builder infrastructure which caches the reflected object state to improve the performance of repeated builds of the same interface with minor adjustments to the builder object. May 11, 2024 · In this article, we’ve discussed how Feign client supports setting request headers. can anybody help please. Multiple request interceptor 위 참고문서에 언급되어 있는 것처럼 requet interceptor는 여러 개를 설정할 수 있다. This approach can be valuable for microservices or applications that rely heavily on external HTTP services, where multiple calls may need to be processed simultaneously. But what happens when you want to add multiple interceptors in a clean, reusable, and testable way? This blog post shows you how to chain multiple Feign RequestInterceptor instances using a composite Jul 9, 2024 · Sending Headers in Feign Client In the modern world of microservices, communication between different services is crucial. Apr 24, 2024 · However, what if your application needs to communicate with multiple services, each requiring different configurations for Feign clients? This scenario is quite common in real-world applications. Using that dependency will In this article, we’ve discussed how Feign client supports setting request headers. In this post I’m not going to talk about the annotations because you can find a good documentation here [1] [2]. builder In some cases, our Feign Clients need to be customized, which is not possible in the annotation manner as described above. I essentially want the HTTP request to turn out similar to this: May 11, 2024 · 1. Let’s define the OAuthFeignConfig configuration class and define the requestInterceptor () bean: Nov 12, 2024 · Using CompletableFuture with Feign Client in Spring Boot enables asynchronous HTTP calls, improving performance by allowing the application to process other tasks concurrently while waiting for a response. 7. 1. Oct 5, 2020 · Here we are discussing how to use feign client to consume REST API from the spring boot application step-by-step with exception handling, Reads, Writes, Paginations. Mar 30, 2015 · It seems that creating feign clients per-request could be a performance concern since reflection is used to generate the proxy. For example, assume that the prefix is X-MyCompany. Feb 2, 2021 · Problem When we use the request interceptor feign to set headers on runtime and we set the same header key with different values, the previous header will not be overwritten. 概述 在使用 Feign 时，有时我们需要设置HTTP调用的请求头。Feign允许我们仅通过声明性语法构建HTTP客户端。 在这篇简短教程中，我们将学习如何使用注解配置请求头，并通过拦截器包含常见的请求头。 Feb 3, 2022 · Calling external services through the REST endpoint is a common activity that was made very straightforward by libraries like Feign. Feign Clients with Multiple Interceptors in Spring Boot When working with Spring Boot and OpenFeign, it's quite common to add custom headers to outbound HTTP requests — like tracking IDs, authentication tokens, or metadata provided by libraries. Jul 14, 2020 · In this tutorial we will learn how to use Feign RequestInterceptor by inject common headers to all outgoing requests in a Spring Boot 2. Each feign client is part of an ensemble of components that work together to contact a remote server on demand, and the ensemble has a name that you give it as an application developer using the @FeignClient annotation. Jul 2, 2019 · I need to add custom Authorization header to some new feign clients. I need headers to be dynamic. value() was empty on parameter 0, Feb 26, 2025 · Feign supports multiple clients for different use cases, including the ApacheHttpClient, which sends more headers with the request, for example, Content-Length, which some servers expect. However, a lot of things can go wrong during such calls. I just don't know how to achieve the same goal with open feign. When gzip or deflate compression of the request body is not enabled, "content-length" is written once, but it is written again later. For instance, the ApacheHttpClient will set the Content-Length header when a Request. Very easy, I’ve done this several times using Spring boot Feign Clients. To sum up: I don't control server side, but I know that the endpoint accepts multiple files and I can upload them using different client. The request may contain 2 headers X-MyCompany-A and X-MyCompany-B. We just need to put in an annotated interface. Digest Authentication: Digest authentication improves upon Basic Authentication by using a challenge–response mechanism where the credentials are hashed along with a nonce (a random value) before being sent. To modify requests before they are sent, you can implement a request interceptor. Apr 30, 2021 · I am using feign client for inter-service communication; question is I am able to send the method/request headers on request level meaning ex: Sep 3, 2023 · When using Feign clients, logging can become verbose, with multiple lines for each request and response. However, the real power of Feign lies in its customization options, allowing you to tailor the clients Feign is a declarative web service client. There are multiple feign clients and one of them requires basic authentication, others do not. In my case I need to send a custom header from the feign client, and none of the approaches seem to work ( using @Headers or using headers=) Relevant code: Sep 23, 2016 · We've a use case where the request may contain any number of headers starting with a predefined prefix. Contribute to OpenFeign/feign development by creating an account on GitHub. In this case Feign does not add a Content-Length header to the request. It has pluggable annotation support including Feign annotations and JAX-RS annotations. 하지만 interceptor들 사이에 순서는 보장할 수 없다고 한다. However, for ease of monitoring and analysis, consolidating these logs into a single line Dec 27, 2023 · This tutorial will provide explanations with examples of how to use query parameters and headers in a Feign client. There is only @Headers there you can specify content type. But, in this case, there are some annotations' signature mismatches which you should ignore in this case. OkHttp does the same thing. Spring Cloud adds support for Spring MVC annotations and for using the same HttpMessageConverters used by default in Oct 10, 2024 · Added more info above. Writing web services with the help of FeignClient is very easier. Rest Client code:- import org. Feign Client Setup Apr 3, 2025 · In a microservices architecture, efficient communication between services is crucial. Logging Configuration May 17, 2024 · Feign Client: RequestInterceptors Primary purpose — “to add headers to all requests”. We’ll start by implementing the most common approach — nothing too fancy, just enough Sep 11, 2023 · Normally we create a new feign client per service and also create an interceptor per service to add additional information like auth headers, api keys etc. http. May 19, 2020 · We are using Feign 10. If you are using spring-cloud-starter-feign Feign using Slf4jLogger for logging. Here's the configuration after the fix import feign. Spring Boot provides multiple ways to achieve this, and Feign Client is one of the most elegant solutions Sep 5, 2023 · Learn about Feign Client and how to use it in a Spring Boot application. RequestInterceptor May 3, 2018 · I have a service that gets http request with an authorization header. We will explore how to customize headers for API requests effectively. So I write an RequestInterceptor and it worked but the point is I don't want this custom RequestInterceptor affect my old clients. It makes writing web service clients easier. Feign also supports pluggable encoders and decoders. Spring Cloud adds support for Spring MVC annotations and for using the same HttpMessageConverters used by default in Jun 22, 2022 · Injecting URL and Headers dynamically at Feign Client The most common use case for Spring Cloud OpenFeign is using it with static URL and Headers but sometimes you need to inject the URL and Feb 19, 2018 · Recently I wrote an article how to explicitly pass headers via Feign clients. Feb 11, 2024 · I'm not sure what I'm doing wrong here. May 18, 2016 · We are developing a suite of Microservices using Spring Cloud framework and one of the the things that we need to do is to set request headers. We implemented that using the @Headers, @HeaderMaps annotation, and request interceptors. The client calls the test-app and then it calls to the translator and Jun 28, 2022 · The problem in your code is feign will use all of RequestInterceptor in application context so that Authorization header is overwrite twice. Oct 26, 2016 · I want every time when I make a request through feign client, to set a specific header with my authenticated user. Following example specifies a method parameter for Dec 7, 2021 · Let us dig into Feign clients more deeply and discuss how Feign clients can be created and configured to call external services using POST, GET methods. GET, path = "/resource", headers = {"myHeader=value"}) Using @Headers with dynamic values in Feign client + Spring Cloud (Brixton RC2) discusses a solution for dynamic values using @RequestHeader. These headers should then be sent with the Feign client request. Learn how to effectively add multiple headers in Feign Client with our detailed guide and examples. Using a Feign client, we get rid of boilerplate code to make the HTTP API requests. Client. With @Configuration removed, there is no RequestInterceptor in application context, feign will use RequestInterceptor specified by @FeignClient. Then you can simply create an interface to the external web-services. Mar 5, 2016 · Overall, this class sets up configurations for formatting date and time types, adding authentication headers, and defining the logging level for the Feign client used in the organization structure Dec 7, 2023 · Feign Client with Api Gateway Many members of our springboot microservice community are encountering issues when communicating with microservices using Feign client. Oct 20, 2019 · FeignClient Interceptor for Bearer Token/OAuth With FeignClient, we can send headers using the @RequestHeader annotation as a method parameter. This is my filter from which I get the authentication and set it to the spring Feign is a declarative web service client in Spring Cloud that simplifies API calls. com Feign client Query Parameters and Headers Jul 23, 2025 · FeignClient also known as Spring Cloud OpenFeign is a Declarative REST Client in Spring Boot Web Application. 1 feign-form-spring / feign-form: 3. Apr 22, 2025 · Through source code analysis, I found that in the feign. I know I can pass a parameter @RequestHeader to a Feign Aug 23, 2018 · I need to pass multiple Request Headers using @FeignClient When its one header of type String the @RequestHeader works fine but with multiple I get RequestHeader. In the era of microservices, where a system consists of multiple parts… levelup. Consider a Feign client that must be used with different configurations at different places in the code, or multiple Feign clients that each must be used with its own configuration. Mar 26, 2025 · We’ll use a RequestInterceptor, which injects the OAuth2 access token into the request of the OpenFeign client by adding an Authorization Bearer header. May 8, 2018 · 4 You can of course annotate the method with a Header annotation and have an extra token parameter for every call your client provides, but that is not really an elegant solution as the caller needs to have access to the API key. Feign은 써볼수록 사용성이 아쉬운 것 같다. I don't know the number or exact names of these headers. Understanding how to handle request headers is crucial for effective communication with APIs, especially when authentication, content type, and other metadata are involved. Otherwise your authentication won't pass and an exception will be thrown, and there will be a different Authorization in the request header. springframework. In a Feign client with Spring Cloud, using dynamic values in @Headers requires some careful handling, especially when you need to pass dynamic headers based on runtime conditions. We’ve a use case where the request may contain any number of headers starting with a predefined prefix. Also, learn the commonly used default Feign configurations and customizing them. Apr 11, 2019 · Feign has out of box logging mechanism and it can be achieved through simple steps. Spring Cloud adds support for Spring MVC annotations and for using the same HttpMessageConverters used by default in Jan 8, 2024 · The @RequestLine Feign annotation specifies the HTTP verb, path, and request parameters as arguments in the Feign client. I've included spring cloud open feign dependency implementation 'org. May 15, 2020 · I explained how to set Authorization header while consuming a basic authenticated REST service. Spring Cloud has it’s own way of defining Feign clients, it’s done with Spring MVC annotations. mkt weyy qqsjv jmjgpq wvrsbie cbwk awdwva bpuvh dnx wsq focio gcladi hvtglv gjfoy mqeqs