CODEWITHSUNDEEP
springspring-mvcspring-boot
Gerrit
Gerrit

Reputation: 435

@RequestHeader mapped value contains header twice

We are facing a super strange problem: in our endpoint:

@PostMapping(value = "/send_event_to_payment_process")
@Async
public void sendEvent(@Valid @RequestBody final SendEventRequestDto dto, @RequestHeader(value = TENANT) String foo) {

the mapped @RequestHeader variable foo contains the vaue twice joined with a ',' ("test,test"). If we read the header programmatically using the request context:

public void sendEvent(@Valid @RequestBody final SendEventRequestDto dto, @Context final HttpServletRequest request) {
final String tenant = request.getHeader(TENANT);

we receive the proper value (only once: "test").

Any clues what the problem might be?!

Thank you!

Upvotes: 1

Views: 1972

Answers (1)

M. Deinum
M. Deinum

Reputation: 124441

You are comparing different things.

The HttpServletRequest.getHeader method always returns a single value, even if there are multiple values for the header. It will return the first (see the javadoc of the method).

Spring uses the HttpServletRequest::getHeaders method to get all the values. Which retrieves all header values and, depending on the value, return the String[] or creates a single concatenated String.

To compare the same things you also should use the getHeaders method and then you will have the same result. Which means your request contains 2 header values for the given header.

Upvotes: 1

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