Configure feign client URL

spring-cloud-modules/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/client/AlbumClient.java

@@ -0,0 +1,15 @@
+package com.baeldung.cloud.openfeign.client;
+
+import com.baeldung.cloud.openfeign.model.Album;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+
+@FeignClient(name = "albumClient", url = "https://jsonplaceholder.typicode.com/albums/")
+public interface AlbumClient {
+    @GetMapping(value = "/{id}")
+    Album getAlbumById(@PathVariable(value = "id") Integer id);
+
+    @GetMapping(value = "/{id}")
+    Album getAlbumByIdAndDynamicUrl(@PathVariable(name = "id") Integer id);
+}

spring-cloud-modules/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/client/PostClient.java

@@ -0,0 +1,12 @@
+package com.baeldung.cloud.openfeign.client;
+
+import com.baeldung.cloud.openfeign.model.Post;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+
+@FeignClient(name = "postClient", url = "${spring.cloud.openfeign.client.config.postClient.url}")
+public interface PostClient {
+    @GetMapping(value = "/{id}")
+    Post getPostById(@PathVariable(value = "id") Integer id);
+}

spring-cloud-modules/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/client/TodoClient.java

@@ -0,0 +1,13 @@
+package com.baeldung.cloud.openfeign.client;
+
+import com.baeldung.cloud.openfeign.model.Todo;
+import feign.RequestLine;
+import org.springframework.cloud.openfeign.FeignClient;
+
+import java.net.URI;
+
+@FeignClient(name = "todoClient")
+public interface TodoClient {
+    @RequestLine(value = "GET")
+    Todo getTodoById(URI uri);
+}

spring-cloud-modules/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/config/DynamicUrlInterceptor.java

@@ -0,0 +1,23 @@
+package com.baeldung.cloud.openfeign.config;
+
+import feign.RequestInterceptor;
+import feign.RequestTemplate;
+
+import java.util.function.Supplier;
+
+public class DynamicUrlInterceptor implements RequestInterceptor {
+
+    private final Supplier<String> urlSupplier;
+
+    public DynamicUrlInterceptor(Supplier<String> urlSupplier) {
+        this.urlSupplier = urlSupplier;
+    }
+
+    @Override
+    public void apply(RequestTemplate template) {
+        String url = urlSupplier.get();
+        if (url != null) {
+            template.target(url);
+        }
+    }
+}

spring-cloud-modules/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/controller/ConfigureFeignUrlController.java

@@ -0,0 +1,80 @@
+package com.baeldung.cloud.openfeign.controller;
+
+import com.baeldung.cloud.openfeign.config.DynamicUrlInterceptor;
+import com.baeldung.cloud.openfeign.client.AlbumClient;
+import com.baeldung.cloud.openfeign.client.PostClient;
+import com.baeldung.cloud.openfeign.client.TodoClient;
+import com.baeldung.cloud.openfeign.model.Album;
+import com.baeldung.cloud.openfeign.model.Post;
+import com.baeldung.cloud.openfeign.model.Todo;
+import feign.Feign;
+import feign.Target;
+import feign.codec.Decoder;
+import feign.codec.Encoder;
+import org.springframework.beans.factory.ObjectFactory;
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
+import org.springframework.cloud.openfeign.FeignClientsConfiguration;
+import org.springframework.cloud.openfeign.support.HttpMessageConverterCustomizer;
+import org.springframework.cloud.openfeign.support.SpringDecoder;
+import org.springframework.cloud.openfeign.support.SpringEncoder;
+import org.springframework.cloud.openfeign.support.SpringMvcContract;
+import org.springframework.context.annotation.Import;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.net.URI;
+
+@RestController
+@Import(FeignClientsConfiguration.class)
+public class ConfigureFeignUrlController {
+    private final AlbumClient albumClient;
+    private final PostClient postClient;
+
+    private final TodoClient todoClient;
+    private final ObjectFactory<HttpMessageConverters> messageConverters;
+
+    private final ObjectProvider<HttpMessageConverterCustomizer> customizers;
+
+    public ConfigureFeignUrlController(AlbumClient albumClient,
+                                       PostClient postClient,
+                                       Decoder decoder,
+                                       Encoder encoder,
+                                       ObjectFactory<HttpMessageConverters> messageConverters, ObjectProvider<HttpMessageConverterCustomizer> customizers) {
+        this.albumClient = albumClient;
+        this.postClient = postClient;
+        this.messageConverters = messageConverters;
+        this.customizers = customizers;
+        this.todoClient = Feign.builder().encoder(encoder).decoder(decoder).target(Target.EmptyTarget.create(TodoClient.class));
+    }
+
+    @GetMapping(value = "albums/{id}")
+    public Album getAlbumById(@PathVariable(value = "id") Integer id) {
+        return albumClient.getAlbumById(id);
+    }
+
+    @GetMapping(value = "posts/{id}")
+    public Post getPostById(@PathVariable(value = "id") Integer id) {
+        return postClient.getPostById(id);
+    }
+
+    @GetMapping(value = "todos/{id}")
+    public Todo getTodoById(@PathVariable(value = "id") Integer id) {
+        return todoClient.getTodoById(URI.create("https://jsonplaceholder.typicode.com/todos/" + id));
+    }
+
+@GetMapping(value = "/dynamicAlbums/{id}")
+public Album getAlbumByIdAndDynamicUrl(@PathVariable(value = "id") Integer id) {
+    AlbumClient client = Feign.builder()
+            .requestInterceptor(new DynamicUrlInterceptor(() -> "https://jsonplaceholder.typicode.com/albums/"))
+            .contract(new SpringMvcContract())
+            .encoder(new SpringEncoder(messageConverters))
+            .decoder(new SpringDecoder(messageConverters, customizers))
+            .target(Target.EmptyTarget.create(AlbumClient.class));
+
+    return client.getAlbumByIdAndDynamicUrl(id);
+}
+}
+
+

spring-cloud-modules/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/model/Album.java

@@ -0,0 +1,32 @@
+package com.baeldung.cloud.openfeign.model;
+
+public class Album {
+
+    private Integer id;
+    private Integer userId;
+    private String title;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Integer userId) {
+        this.userId = userId;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+}

spring-cloud-modules/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/model/Todo.java

@@ -0,0 +1,40 @@
+package com.baeldung.cloud.openfeign.model;
+
+public class Todo {
+    private Integer id;
+    private Integer userId;
+    private String title;
+    private Boolean completed;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Integer userId) {
+        this.userId = userId;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public Boolean getCompleted() {
+        return completed;
+    }
+
+    public void setCompleted(Boolean completed) {
+        this.completed = completed;
+    }
+}

spring-cloud-modules/spring-cloud-openfeign/src/main/resources/application.properties

@@ -8,3 +8,5 @@ spring.security.oauth2.client.registration.keycloak.authorization-grant-type=cli
 spring.security.oauth2.client.registration.keycloak.client-id=payment-app
 spring.security.oauth2.client.registration.keycloak.client-secret=863e9de4-33d4-4471-b35e-f8d2434385bb
 spring.security.oauth2.client.provider.keycloak.token-uri=http://localhost:8083/auth/realms/master/protocol/openid-connect/token
+
+spring.cloud.openfeign.client.config.postClient.url=https://jsonplaceholder.typicode.com/posts/