Nima: 'Accept-Encoding' header parse error

[ukarim]

Environment Details

• Helidon Version: 4.0.0-ALPHA5
• Helidon SE

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Problem Description

Nima webserver fails to parse Accept-Encoding if header contains list of codings separated by only commas.
For example, this value gzip;q=1.0,deflate;q=0.6,identity;q=0.3 leads to NumberFormatException inside io.helidon.nima.http.encoding.ContentEncodingSupportImpl$EncodingWithQ.parse method.

Current parser uses comma+space as delimiter, but it seems that accoring to rfc that space is optional.
Actually I discovered this issue doing http requests to nima server using ruby's standard http client.

Steps to reproduce

Do following request to Nima webserver

curl -H 'Accept-Encoding: gzip;q=1.0,deflate;q=0.6,identity;q=0.3' http://localhost:8080