Custom schemes create application entry points. Validate parameters and authority for the requested operation separately.
Evaluation approach
Limit schemes, destinations and parameter contracts. Sensitive actions need suitable sessions and approval rather than direct completion from a link.
Application example
A campaign link may select a coupon, but the server calculates entitlement. A URL-supplied amount is not an authoritative price.
Limits and considerations
An expected scheme name does not prove a legitimate caller.
What authority does a link carry?
A URL should usually express a request or destination, not transaction authority. Account changes, payments and secret display may require renewed verification. Avoid directly turning parameters into file paths or network destinations.
Checks and decisions
- Validate parameters
- Authorize server-side
- Confirm sensitive actions
Sources
The primary references above provide the technical basis. Example workflows and evaluation suggestions are this publication’s explanations, not independent test results for a particular product.