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Hi Hubert,
Thanks for the rapid feedback. Yes, alas we are focussed on v11.
As the `RANGE` header is not available in v11, reusing `POST` with the intent to append to a file seems a good option. Append is our use-case atm anyway. As for v12; the `PATCH` - `RANGE` option looks great :-)
Many thanks , Adam
Hi Adam,
As of TM1 v12 we have support for `Range` header. The `Range` header allows for partial content manipulation, typically used for downloading parts of a file (like TM1 v12 does thus far), but some services are known to extend this feature to allow partial file uploads as well. In such a case, a client could append to or update part of a file using byte-range updates.
Whilst that would most closely mimic what the C-API used to do, albeit not the intend by itself, appending would require you to know what the size of the file is first. The most commonly used pattern for this is to use a so called preflight `HEAD` request to determine the size and then subsequently use the return `Content-Length` header for the range. To be sure that the file wouldn't have changed in the meantime, read: between the preflight and append request, one could use the returned e-tag and pass it in a `If-Match` header.
Some services, but this would be service specific (read: not standard base) reuse `POST` to say that the intend is to append to a file. Other protocols, like WebDAV (an extension of HTTP) introduced it's own `APPEND` method to make it very clear what the intend is (still service specific for an OData compliant service like TM1).
My proposal, presuming we do this, would be to build on what's already there and add support for `PATCH` on the files on Contents (we no longer treat 'Blobs' special) where the `Range` header can be used to indicate what part of the file needs to be patched (without the Range header it would be the same as `PUT`). TM1 already supports preflight `HEAD` requests and optimistic concurrency control (read: `If-Match') so appending could be accomplished as well.
Would that work?
But let me guess, you'd want this in TM1 v11 as well ;-?
Kind Regards, Hubert