Parsing query strings with keys of the same name

[alexmingoia]

The browser behavior (and standard if I can dig up the forms spec) of HTML forms with array-like values is to include a query string with repeated keys.

This multi-select:

<select name="colors" multiple>
  <option value="orange">orange</option>
  <option value="purple">purple</option>
</select>

Will result in ?colors=orange&colors=purple if both options are selected. Instead of parsing this as a list, parseQuery ignores the second value. Furthermore, the query is represented as a lookup map of bytestrings, so has no notion of multiple values per key.

The reason I bring this issue up is this use case: basic HTML form with a multi-select and no JS and a haskell backend using http-types. The http-types Query type and parsers fail that use case.

[aristidb]

Fair point. How about this?
We leave Query and QueryItem as is, but make a generic Query-like type that allows putting in Maybe or [], and we just use a generic "append" operation that either replaces or adds an element.

I would most welcome pull requests for this! :-)

[aristidb]

To clarify: The parseQuery function would always work in terms of the generic type.

[Vlix]

I'm pretty sure parseQuery just creates a list of key-value pairs. (at least currently)