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Allow interceptors to add existing header values

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Provide a fully mutable HttpHeaders to ClientHttpRequestInterceptors
of a RestTemplate when headers are set using HttpEntity. This avoids
UnsupportedOperationException if both HttpEntity and
ClientHttpRequestInterceptor add values for the same HTTP header.

Issue: SPR-15066
This commit is contained in:
sdeleuze
2017-12-08 12:42:16 -08:00
parent 55fc731c59
commit 4b8a937bee
2 changed files with 38 additions and 13 deletions
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6
spring-web/src/main/java/org/springframework/web/client/RestTemplate.java
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@@ -20,6 +20,8 @@ import java.io.IOException;
import java.lang.reflect.Type;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
@@ -837,7 +839,9 @@ public class RestTemplate extends InterceptingHttpAccessor implements RestOperat
HttpHeaders httpHeaders = httpRequest.getHeaders();
HttpHeaders requestHeaders = this.requestEntity.getHeaders();
if (!requestHeaders.isEmpty()) {
httpHeaders.putAll(requestHeaders);
for (Map.Entry<String, List<String>> entry : requestHeaders.entrySet()) {
httpHeaders.put(entry.getKey(), new LinkedList<String>(entry.getValue()));
}
}
if (httpHeaders.getContentLength() < 0) {
httpHeaders.setContentLength(0L);