Spring Cloud Gateway Server Web MVC报错“Unsupported transfer encoding: chunked”解决

本文主要介绍在Spring Cloud Gateway Server Web MVC中报错“Unsupported transfer encoding: chunked”问题的原因，及解决方案。

org.apache.hc.core5.http.NotImplementedException: Unsupported Unsupported transfer encoding: chunked 错误通常是由于 Feign 依赖的 HTTP 客户端与服务端使用的 chunked 传输编码不兼容 导致的。具体原因和解决方案如下：

原因分析

基于Spring Cloud Gateway Server Web MVC的API网关问题控制台输出报错信息如下：

org.apache.hc.core5.http.NotImplementedException: Unsupported transfer encoding: chunkedat org.apache.hc.core5.http.impl.DefaultContentLengthStrategy.determineLength(DefaultContentLengthStrategy.java:90) ~[httpcore5-5.3.4.jar:5.3.4]at org.apache.hc.core5.http.impl.io.DefaultBHttpClientConnection.receiveResponseEntity(DefaultBHttpClientConnection.java:355) ~[httpcore5-5.3.4.jar:5.3.4]at org.apache.hc.core5.http.impl.io.HttpRequestExecutor.execute(HttpRequestExecutor.java:213) ~[httpcore5-5.3.4.jar:5.3.4]at org.apache.hc.client5.http.impl.classic.InternalExecRuntime.lambda$execute$0(InternalExecRuntime.java:236) ~[httpclient5-5.4.4.jar:5.4.4]at org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager$InternalConnectionEndpoint.execute(PoolingHttpClientConnectionManager.java:791) ~[httpclient5-5.4.4.jar:5.4.4]at org.apache.hc.client5.http.impl.classic.InternalExecRuntime.execute(InternalExecRuntime.java:233) ~[httpclient5-5.4.4.jar:5.4.4]

虽然错误是报在API网关，但实际是需要在微服务中去解决。问题原因如下：

HTTP 中的 chunked 传输编码用于动态分块传输数据（适用于数据大小不确定的场景）。该错误表明：

• 服务端返回的响应使用了 Transfer-Encoding: chunked 编码。
• Feign 客户端使用的 HTTP 客户端（如 Apache HttpClient 5.x）不支持或未正确配置 chunked 编码处理。

解决方案

REST接口类型尽量采用具体类型，避免 Feign 客户端调用过程中导致推导类型失真。

例如：

@FeignClient(name = "rednote-content-microservice",fallback = ContentServiceClientFallback.class // 指定降级实现类
)
public interface ContentServiceClient {@GetMapping("/note/user/{userId}")ResponseEntity<?> getNotesWithUser(@PathVariable Long userId,@RequestParam(defaultValue = "1") int page,@RequestParam(defaultValue = "12") int size);
}

改为：

@FeignClient(name = "rednote-content-microservice",fallback = ContentServiceClientFallback.class // 指定降级实现类
)
public interface ContentServiceClient {@GetMapping("/note/user/{userId}")ResponseEntity<NotesWithUserDto> getNotesWithUser(@PathVariable Long userId,@RequestParam(defaultValue = "1") int page,@RequestParam(defaultValue = "12") int size);
}

@GetMapping("/user/{userId}")
public ResponseEntity<?> getNotesWithUser(@PathVariable Long userId,@RequestParam(defaultValue = "1") int page,@RequestParam(defaultValue = "12") int size) {ResponseEntity<UserDto> response = userServiceClient.findByUserId(userId);UserDto user = response.getBody();// 获取用户笔记列表（分页）Page<Note> notePage = noteService.getNotesByUser(userId, page - 1, size);// 转换为 DTOList<NoteExploreDto> noteExploreDtoList = notePage.map(note -> noteService.toExploreDto(note, user)).getContent();Map<String, Object> map = new HashMap<>();map.put("user", user);map.put("noteList", noteExploreDtoList);map.put("currentPage", page);map.put("totalPages", notePage.getTotalPages());return ResponseEntity.ok().body(map);
}

改为：

@GetMapping("/user/{userId}")
public ResponseEntity<?> getNotesWithUser(@PathVariable Long userId,@RequestParam(defaultValue = "1") int page,@RequestParam(defaultValue = "12") int size) {ResponseEntity<UserDto> response = userServiceClient.findByUserId(userId);UserDto user = response.getBody();// 获取用户笔记列表（分页）Page<Note> notePage = noteService.getNotesByUser(userId, page - 1, size);// 转换为 DTOList<NoteExploreDto> noteExploreDtoList = notePage.map(note -> noteService.toExploreDto(note, user)).getContent();NotesWithUserDto dto = new NotesWithUserDto(user, noteExploreDtoList, page, notePage.getTotalPages());ResponseEntity<NotesWithUserDto> responseEntity = ResponseEntity.ok().body(dto);return responseEntity;
}

参考引用

• 本文同步至：https://waylau.com/spring-cloud-gateway-server-webmvc-unsupported-transfer-encoding-chunked
• 源码见《跟老卫学Spring Cloud开发》开源免费教程， https://github.com/waylau/spring-cloud-tutorial/
• 《Spring Boot 企业级应用开发实战》（北京大学出版社）
• 《Spring Cloud 微服务架构开发实战》（北京大学出版社）
• 《Spring 5 开发大全》（北京大学出版社）