Content-Disposition response header duplicated for failed StreamingResponseBody #35116
Description
Spring Boot: 3.3.13; 3.4.7
If return type in Controller is ResponseEntity and Content-Disposition header is set, it's copied in error response which defined in ControllerAdvice.
if you also define Content-Disposition header in error response, the header is duplicated.
package com.example.demo; import java.io.FileInputStream; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody; @RestController public class DefaultController { @GetMapping("/") public ResponseEntity<StreamingResponseBody> getMethodName() { return ResponseEntity.ok() .contentType(MediaType.APPLICATION_OCTET_STREAM) .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"report.txt\"") .body(out -> { try (var in = new FileInputStream("C:\\template.txt")) { byte[] buffer = new byte[1024]; int len; while ((len = in.read(buffer)) > 0) { out.write(buffer, 0, len); } } }); } }package com.example.demo; import java.io.FileNotFoundException; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.RestControllerAdvice; @RestControllerAdvice public class DefaultExceptionHandler { @ExceptionHandler ResponseEntity<String> handle(FileNotFoundException e) { return ResponseEntity.internalServerError() .contentType(MediaType.TEXT_PLAIN) .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; inline") .body("File not found"); } }http request log
* Preparing request to http://localhost:8080/ * Current time is 2025-06-26T10:26:12.266Z * Enable automatic URL encoding * Using default HTTP version * Enable timeout of 30000ms * Disable SSL validation * Hostname in DNS cache was stale, zapped * Trying 127.0.0.1:8080... * Connected to localhost (127.0.0.1) port 8080 (#13) > GET / HTTP/1.1 > Host: localhost:8080 > User-Agent: insomnia/11.0.2 > Accept: */* * Mark bundle as not supporting multiuse < HTTP/1.1 500 < Content-Disposition: attachment; filename="report.txt" < Content-Disposition: attachment; inline < Content-Type: text/plain < Content-Length: 14 < Date: Thu, 26 Jun 2025 10:26:12 GMT < Connection: close * Received 14 B chunk * Closing connection 13 I also attached demo project to reproduce it.