An API proxy verifies that a valid API key is present in the request sent to the service (often sent as a query parameter). This helps prevent unauthorized access to an API.

Proxies provide a way to proxy verification API manage and control the services that app developers access. They can be configured to perform specific functions, such as routing, authentication and quota management. They can also be used to provide a more secure interface between apps and backend services by encrypting and securing connections.

A proxy can also act as a cache by storing copies of frequently accessed data “closer” to the device making the request, rather than at a server. This can reduce latency and make requests more efficient.

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For example, a travel site could use a proxy to request flights from several different airlines based on location, price and other criteria. Without a proxy, each call would need to be made separately. Proxies make these kinds of requests more efficient and can help to save bandwidth and resources.

In addition, proxies can intercept and mock responses to test application behavior in integration and end-to-end tests. Tools like Dev Proxy, Fiddler, Mitmproxy or Charles Proxy can be used to capture and inspect HTTP traffic in development environments and for testing purposes. This information can be used to identify issues and test alternatives.