serverWebExchange.getResponse().getHeaders().add(name, value) UnsupportedOperationException
tags: SpringCloud gateway
unusual phenomenon
Today, modify the value of the ServerWeBexchange response header in Spring Cloud Gateway, and reported the following exception:
java.lang.UnsupportedOperationException: null
at org.springframework.http.ReadOnlyHttpHeaders.add(ReadOnlyHttpHeaders.java:67) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
Here is that we use ReadOnlyHttpHeaders, it is only read-only. But when I went to the getHeaders () method of ServerHttpResponse, I found that httpheaders, and httpheaders can be modified; after patient thinking: ServerHttpResponse is submitted to readonlyhttpheaders instead of httpheaders, so give it The following solution:
Abnormal resolution
ServerHttpResponse response = erverWebExchange.getResponse();
response.beforeCommit(() -> {
response.getHeaders().add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
return Mono.empty();
});
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