HttpClient incorrectly encodes query params containing spaces with + and not %20

[jamesdh]

Expected Behavior

When using Micronaut's HttpClient to make a request to an endpoint using query params that contain spaces, the spaces are correctly encoded as %20 per RFC3986 (URI Generic Syntax).

Actual Behaviour

The spaces are encoded as +. That's because DefaultUriBuilder uses java.net.URLEncoder for query parameter encoding, which in turn is based off of the W3C's HTML 4 specification and subsequently encodes spaces as +

See this StackOverflow answer for a better understanding of some of the confusion. For reference, Spring's UriUtils is correctly based on RFC3986

Steps To Reproduce

No response

Environment Information

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Example Application

No response

Version

4.7.1