Fix handling of filename for http file

[timotheeguerin]

fix #3532

[azure-sdk]

All changed packages have been documented.

• ✅ @typespec/http

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@typespec/http - internal ✏️

Fix handling of filename for http file

[azure-sdk]

You can try these changes at https://cadlplayground.z22.web.core.windows.net/prs/3538/

Check the website changes at https://tspwebsitepr.z22.web.core.windows.net/prs/3538/

[weidongxu-microsoft]

Is there a way to say "filename default to <some_name> if not provided by user" (a kind of client default)? -- the usual case for this is that filename is required on backend and client want to provide a default (e.g. openai)

[msyyc]

Is there a way to say "filename default to <some_name> if not provided by user" (a kind of client default)? -- the usual case for this is that filename is required on backend and client want to provide a default (e.g. openai)

Ever discussed here #3046 (comment) while it seems no plan to support "define default value in client side" in Typespec.

[chunyu3]

Is there a way to say "filename default to <some_name> if not provided by user" (a kind of client default)? -- the usual case for this is that filename is required on backend and client want to provide a default (e.g. openai)

Ever discussed here #3046 (comment) while it seems no plan to support "define default value in client side" in Typespec.

.NET does not honor client-side-default-value, but we honor constant. so if the filename is define as filename: "file" it is a constant, .NET will not expose parameter for filename, but will set filename=file in the http request in content-dispose header.