asynchronous request with callback in Apigee -

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how can implement asynchronous callback scenario in apigee.

for example need call host , host may take time process response. once response ready needs delivered caller/client.

thanks in advance

regards

can not claim standard way of doing this, here design:

assumption: target host must support registering call url.

when client calls apigee proxy, apigee proxy in middle can generate unique callback url , send target parameter when making api request. in meantime have block client ( , start polling internal storage).

the callback url proxy in apigee receives response target side , updates entry in apigee persistence store, being polled first proxy.

if callback happens within x seconds, apigee proxy can send response client. if not happen within time can send error.

to implement can use key value map or caching policy in apigee transient persistence store. , blocking client , polling persistence store use java or javascript policies


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