Whitespace requirement might be too harsh

[yoavweiss]

Whitespace is not allowed in the field-value between each field-name and its parameter set.

As a potential implementor it makes the parsing algorithm simpler, but I'm also afraid it'd create a subtle way in which people would fail to deploy this syntax in real life.

Since supporting whitespace won't add significant complexity to the parsing algorithm, can we allow it?

[mnot]

Moving to http-extensions repo.