In a subresource the parameter value will be an empty string.

[jeijei4]

Issue #, if available:

Description of changes:

The documentation explains:
when a request targets a subresource, the corresponding query parameter value will be an empty string ("").

Example:
"http://s3.amazonaws.com/examplebucket?acl"

The CanonicalQueryString in this case is as follows:

UriEncode("acl") + "=" + ""

https://docs.aws.amazon.com/IAM/latest/UserGuide/create-signed-request.html#create-canonical-request

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[stobrien89]

Hi @jeijei4,

Thanks for the PR. Apologies for the delayed reply. Thanks for raising this — Psr7\Query::parse produces ['acl' => null] for subresource parameters, and the existing null-coalescing in getCanonicalizedQuery already handles this correctly by emitting acl= as the spec requires. No change is needed at this time.