To implement a REST service, I need an async C++ HTTP framework, which is based on reactor or proactor model. This library was created to have first class support of async/await and to act as a core building block for production systems written in Rust. HTTP.sys provides connection management, bandwidth throttling, and web server logging.
It returns an HTTP 202 (Accepted) status code, acknowledging that the request has been received for processing.The API should validate both the request and the action to be performed before starting the long running process.
Commonly these API calls take place over the HTTP(S) protocol and follow REST semantics.In most cases, APIs for a client application are designed to respond quickly, on the order of 100 ms or less. It should have the following additional headers:You may need to use a processing proxy or facade to manipulate the response headers or payload depending on the underlying services used.If the status endpoint redirects on completion, either Upon successful processing, the resource specified by the Location header should return an appropriate HTTP response code such as 200 (OK), 201 (Created), or 204 (No Content).If an error occurs during processing, persist the error at the resource URL described in the Location header and ideally return an appropriate response code to the client from that resource (4xx code).Not all solutions will implement this pattern in the same way and some services will include additional or alternate headers. An info window centered on the user's geolocation coordinates obtained by using HTML5 geolocation will pop up when the application starts.
10/22/2019; 9 minutes to read; In this article. This situation is a potential problem for any synchronous request-reply pattern.Some architectures solve this problem by using a message broker to separate the request and response stages. Others, such as network infrastructure, are largely out of the control of the application developer. This library offers both HTTP and WebSocket support, and its interface is designed to eliminate the learning curve if you already know Asio:
Even when callbacks are possible, the extra libraries and services that are required can sometimes add too much extra complexity.The client application makes a synchronous call to the API, triggering a long-running operation on the backend.The API responds synchronously as quickly as possible.
For example, Azure Logic Apps supports this pattern natively can be used as an integration layer between an asynchronous API and a client that makes synchronous calls.
I think boost asio socket is a good async TCP/UDP framework, but it's lack of HTTP support.
More specifically, how to modify this Async server . In that case, it isn't feasible to wait for the work to complete before responding to the request. For example, if the asynchronous operation creates a new resource, the status endpoint would redirect to the URL for that resource.There are a number of possible ways to implement this pattern over HTTP and not all upstream services have the same semantics. Anybody can recommend one? wiremock provides out-of-the-box a set of matching strategies, but more can be defined to suit your testing needs via the Match trait.
If the request is invalid, reply immediately with an error code such as HTTP 400 (Bad Request).The response holds a location reference pointing to an endpoint that the client can poll to check for the result of the long running operation.The API offloads processing to another component, such as a message queue.While the work is still pending, the status endpoint returns HTTP 202. The basic flow for handling an RPC asynchronously is: Build a server exporting the async service To implement a REST service, I need an async C++ HTTP framework, which is based on reactor or proactor model.