Strip leading/trailing whitespace from JSON inputs.

[LegallyGeek]

When I created a client account, I fat fingered and did

"redirect_uris": [" https://

Notice the space in front of the https? When you do calls later, if the passed referring URL doesn’t include the leading space it throws a redirect mismatch. If possible, stripping leading and trailing whitespace for JSON values may help avoid this.

[christiansmith]

Thanks @LegallyGeek. Great catch.