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HttpHeaders.writableHttpHeaders properly handles HttpHeaders.EMPTY

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Issue: SPR-17633
This commit is contained in:
Juergen Hoeller
2019-01-08 00:32:27 +01:00
parent 1faeeaea14
commit 6e3f974951
1 changed files with 7 additions and 3 deletions
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10
spring-web/src/main/java/org/springframework/http/HttpHeaders.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2018 the original author or authors.
* Copyright 2002-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -1694,11 +1694,15 @@ public class HttpHeaders implements MultiValueMap<String, String>, Serializable
}
/**
* Return a {@code HttpHeaders} object that can read and written to.
* Return a {@code HttpHeaders} object that can be read and written to.
* @since 5.1.1
*/
public static HttpHeaders writableHttpHeaders(HttpHeaders headers) {
Assert.notNull(headers, "HttpHeaders must not be null");
if (headers instanceof ReadOnlyHttpHeaders) {
if (headers == EMPTY) {
return new HttpHeaders();
}
else if (headers instanceof ReadOnlyHttpHeaders) {
return new HttpHeaders(headers.headers);
}
else {