Spring HTTP requests with malformed form url encoded data result in HTTP 500, not 400

Affects: 5.3.9

HTTP requests with malformed form url encoded data result in HTTP 500, not 400. I observed that in a WebFlux application when form data is mapped into my object using built-in mapping or when accessed via ServerWebExchange.formData. Exception is raised in FormHttpMessageReader and maps to HTTP 500. It should be 4xx error as the input is malformed

Example HTTP requests body causing problems:

username=test%%%invalid

Comment From: snicoll

Can you please share a small sample we can run ourselves to reproduce what you've described?

Comment From: spring-projects-issues

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Comment From: spring-projects-issues

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