Skip to content

Asynchronous Request Processing in RESTful APIs

In the context of asynchronous request processing in RESTful APIs, when the server receives a complex write request, it immediately returns a 202 Accepted status code to the client. This response indicates that the request has been accepted for processing, but the processing has not yet been completed. By sending a 202 Accepted response, the server effectively allows the client to continue with other tasks without waiting for the final outcome of the requested operation. This approach is particularly beneficial in high-traffic scenarios, as it helps in reducing client-side latency and improves the efficiency of the server by enabling it to handle multiple requests more effectively. The client can later check the status of the request through a specific endpoint provided by the server, typically using a resource identifier returned with the 202 Accepted response. This mechanism ensures that the client remains informed about the progress and eventual completion of the request, all while maintaining a non-blocking interaction model that optimizes the use of resources on both the client and server sides.

Asynchronous request processing is a key strategy in RESTful APIs for managing time-intensive operations, particularly effective in high-traffic scenarios. Resilis leverages this approach to benefit origin servers, especially in handling complex write requests that are idempotent.

When leveraging asynchronous request processing in RESTful APIs, particularly for complex write operations, it is critical to implement idempotent design patterns. Idempotency guarantees that making the same request multiple times has the same effect as making it just once. This is essential in high-traffic scenarios where network issues can lead to multiple retries of the same request. Without idempotency, such retries could result in unintended consequences, like duplicate records or inconsistent states.

In designing your API, ensure that operations, especially POST, PUT, and DELETE, are idempotent. This will help maintain the integrity and consistency of your system’s state, providing a more reliable and robust service for your users. Remember, idempotency is not just a best practice but a cornerstone of effective API design in asynchronous and high-traffic environments.

Asynchronous Operations in REST APIs and Their Benefits

In REST APIs, asynchronous processing is ideal for operations that are prolonged or intricate. Such tasks include:

  • Complex Financial Transactions: These involve multiple verification and reconciliation steps that are efficiently executed asynchronously.
  • Batch Data Processing: Processing large data sets asynchronously keeps the API responsive.
  • Long-Running Computations: Tasks requiring extensive computation, like generating analytics or reports.

Implementing asynchronous processing for these tasks ensures that the origin server remains responsive.

Resilis’s Asynchronous Processing: Queueing and Adaptive Forwarding

Resilis’s asynchronous request processing, equipped with a queuing system and an adaptive forwarding strategy, offers significant advantages to the client’s origin server:

  • Queue Management: Resilis queues incoming write requests, such as POST and PUT. This buffering controls the request flow to the origin server, aiding in its stability.
  • Adaptive Forwarding to Origin Servers: Resilis adapts its request forwarding based on the origin server’s performance. Monitoring factors like failure rates and response times, it optimizes the pace of forwarding. This ensures that during high-demand periods, the origin server maintains faster response times and reduced strain.
  • High-Traffic Optimization: In peak traffic times, Resilis’s adaptive approach is crucial for helping the origin server sustain efficient performance and quick responses.
  • Resource Utilization and Cost Efficiency: Intelligent load management on the origin server through this strategy leads to optimized resource use and cost savings.
  • Enhanced User Experience for Clients: Users receive prompt acknowledgments of their requests(HTTP status code 202), with the assurance that their operations are processed efficiently in the background.


Through its advanced asynchronous request processing system, Resilis significantly aids in managing high-volume and complex operations for its clients’ APIs. This approach ensures that the clients’ origin servers can maintain efficiency, cost-effectiveness, and responsiveness, even in demanding situations.