librdkafka++1 Debian/Ubuntu package downloads fail with "NoSuchKeyError" due to missing URL encoding/decoding for plus signs

[graskovi]

Description

When attempting to download the debian packages for librdkafka++1 from packages.confluent.io/clients/.../librdkafka instead of downloading the .deb file it redirects to an error page:

How to reproduce

1. Go to librdkafka packages page
2. Click on any link prefixed with "librdkafka++1", or to see exact match for screenshot above go to librdkafka++1_2.10.1
3. Note: a workaround is to take the URL that isn't working and manually encode each "+" character to "%2b", as the following link works and is identical except for the "+" characters getting replaced with "%2b": packages.confluent.io/clients/deb/pool/main/libr/librdkafka/librdkafka%2b%2b1_2.10.1-1.cflt~ubu22_amd64.deb

Broken (the 2 "+" characters are converted to a single space inside the Key tag/block):
https://packages.confluent.io/clients/deb/pool/main/libr/librdkafka/librdkafka++1_1.5.2-1.cflt~deb10_amd64.deb
Works:
https://packages.confluent.io/clients/deb/pool/main/libr/librdkafka/librdkafka%2b%2b1_1.5.2-1.cflt~deb10_amd64.deb