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[Edison-T]

Problem

When users pass values with spaces without quoting (e.g., name=Foo Bar), HTTPie returns an error message like:

argument REQUEST_ITEM: 'Bar' is not a valid value

This message can be confusing, especially for users unfamiliar with how the shell splits arguments.

Solution

This change improves the error message by adding a helpful hint suggesting that values containing spaces should be quoted.

Example

Before:

argument REQUEST_ITEM: 'Bar' is not a valid value

After:

argument REQUEST_ITEM: 'Bar' is not a valid value

Hint: If your value contains spaces, quote it.
Example: name='Foo Bar'

Notes

• This change does not modify parsing logic
• It only improves user feedback for a common mistake
• Inspired by issue Can't send long string from cli #1665