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RestTemplate.exchange is returning a ResponseEntity with ReadOnlyHttpHeaders. I want to add/modify these headers but since it is read only how do I do that?

Jumpman
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3 Answers3

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In case of above answer did not work for you, try below 

HttpHeaders httpHeaders = HttpHeaders.writableHttpHeaders(httpEntity.getHeaders());
ExploreEv
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    It works for me, thanks ! I noticed that the headers in the actual httpEntity are updated when httpHeaders is updated. – mistergreen Jan 14 '22 at 07:44
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ServerHttpRequest request = exchange.getRequest().mutate().header("key", new String[] {"value"}).build();

ServerWebExchange mutatedExchange = exchange.mutate().request(request).build();

And the mutatedExchange will have a header with the new key: value pair.

Xelian
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HttpHeaders implements MultiValueMap, you can create a new mutable HttpHeaders including ReadOnlyHttpHeaders and modify:

        HttpHeaders readOnlyHttpHeaders = ...

        HttpHeaders mutableHttpHeaders = new HttpHeaders(readOnlyHttpHeaders);
        mutableHttpHeaders.put("foo", List.of("bar"));
tsarenkotxt
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    This doesn't work in the latest Spring version at the time of writing this (5.2.6). The constructor simply stores a reference to the `ReadOnlyHttpHeaders` instance passed in and delegates all operations to it, which all throw an exception (because it's read only, of course). – Hasan Aslam May 28 '20 at 15:46