RestClientResponseException handles responseHeaders case-sensitive #31978
Description
Starting with spring-web 6.1.2, the HttpHeaders supplied to RestClientResponseException are copied into a new LinkedMultiValueMap, that is not case-insensitive anymore.
Headers from getResponseHeaders() can then no longer be found without the correct case.
public RestClientResponseException( String message, HttpStatusCode statusCode, String statusText, @Nullable HttpHeaders headers, @Nullable byte[] responseBody, @Nullable Charset responseCharset) { ... this.responseHeaders = copyHeaders(headers); ... } private static HttpHeaders copyHeaders(@Nullable HttpHeaders headers) { if (headers != null) { MultiValueMap<String, String> result = new LinkedMultiValueMap<>(headers.size()); headers.forEach((name, values) -> values.forEach(value -> result.add(name, value))); return HttpHeaders.readOnlyHttpHeaders(result); } else { return null; } }