Support Prefer: `respond-async,wait=1` for TM1 v12

[MariusWirtz]

TM1 v12 introduces an enhanced async request mode via the HTTP header:

Prefer: respond-async,wait=1

With this mode, the server returns a normal synchronous response if the operation completes within the specified wait time. Only if the operation exceeds the wait time does it revert to the standard asynchronous behavior and return an asynchronous ID.

Benefits

This can drastically improve overall performance in scenarios with many small requests that typically complete very quickly. Instead of incurring async polling overhead for each call, most requests would complete synchronously while still preserving async behavior for longer-running operations.

[macsir]

Nice, does wait=1 mean waiting for 1 second in your example? What is the maximum waiting time we can set if so? Get Outlook for iOS<https://aka.ms/o0ukef>

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________________________________ From: Marius Wirtz ***@***.***> Sent: Tuesday, January 13, 2026 6:02:23 AM To: cubewise-code/tm1py ***@***.***> Cc: Subscribed ***@***.***> Subject: [cubewise-code/tm1py] Support Prefer: `respond-async,wait=1` for TM1 v12 (Issue #1331) [https://avatars.githubusercontent.com/u/15182131?s=20&v=4]MariusWirtz created an issue (cubewise-code/tm1py#1331)<#1331> TM1 v12 introduces an enhanced async request mode via the HTTP header: Prefer: respond-async,wait=1 With this mode, the server returns a normal synchronous response if the operation completes within the specified wait time. Only if the operation exceeds the wait time does it revert to the standard asynchronous behavior and return an asynchronous ID. Benefits This can drastically improve overall performance in scenarios with many small requests that typically complete very quickly. Instead of incurring async polling overhead for each call, most requests would complete synchronously while still preserving async behavior for longer-running operations. — Reply to this email directly, view it on GitHub<#1331>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAZQV7ORNODVBKLEXMVACS34GP4U7AVCNFSM6AAAAACROVVU22VHI2DSMVQWIX3LMV43ASLTON2WKOZTHAYDKOBQG4ZTANQ>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[MariusWirtz]

Nice, does wait=1 mean waiting for 1 second in your example? What is the maximum waiting time we can set if so?

Yes.
The connection timeout in v12 (PAaaS) is set to 1 minute. So any value above or near 60 wouldn't make sense.

I think we want as many sync requests as possible and only resort to async in long-running edge cases.
I think we could make it configurable and use a high default value like 55