compute/v1: reservationSubBlocks.get missing allowReserved: true for parentName

[martinb3]

Is this a client library issue or a product issue?
This is a client library issue resulting from incorrect API metadata in the Discovery Document used for generation.

Environment details

• Programming language: Go
• OS: N/A (General SDK issue)
• Language runtime version: Go 1.21+
• Package version: google-api-go-client/compute/v1

Steps to reproduce

1. Attempt to use the generated Service.ReservationSubBlocks.Get method.
2. Provide the parentName as specified in the API documentation: reservations/{res}/reservationBlocks/{block}.
3. Observe that the SDK's internal URI builder escapes the forward slashes in parentName (e.g., reservations%2F...) because the parameter lacks the allowReserved: true attribute in the Discovery metadata.
4. Note that users are currently forced to manually call url.PathEscape on the parentName to "trick" the library into producing a valid URL for the backend.

Technical Root Cause

The Discovery Document for compute.reservationSubBlocks.get defines the parentName parameter as follows:

"parentName": {
  "description": "The name of the parent reservation and parent block. In the format of\nreservations/{reservation_name}/reservationBlocks/{block_name}",
  "location": "path",
  "required": true,
  "type": "string"
}

Because the value must contain forward slashes to reach the endpoint as defined in the path and flatPath, this parameter requires "allowReserved": true. Without this attribute, the Go generator assumes the string is a single path segment and escapes it strictly.

Please update the Discovery metadata for this resource to include "allowReserved": true.

[diviner524]

@martinb3 Could you please share your sample code? And also when did you observe this issue?

There was an issue for the reservationSubBlocks API which requires the forward slash in "reservations/{res}/reservationBlocks/{block}" to be encoded, otherwise 404 errors will be returned. We are looking into a fix and hope it will be addressed in the upcoming Go client.

[mingkang111]

@diviner524 we have this issue on Feb.
The problematic code:

       parentName := fmt.Sprintf("reservations/%s/reservationBlocks/%s", reservation, block)
	req := &computepb.GetReservationSubBlockRequest{
		Project:             reservationProject,
		Zone:                zone,
		ParentName:          parentName,
		ReservationSubBlock: subBlockName,
	}

	response, err := ga.reservationSubBlocksClient.Get(ctx, req)

In log, we found the url sent was:

2026/02/13 11:02:37 INFO gcp sdk http response method=GET url=https://compute.googleapis.com/compute/v1/projects/xxxx/zones/xxx/reservations/xxx/reservationBlocks/xxx/reservationSubBlocks/xxx status_code=404

While in working version:

        parentName := url.PathEscape(fmt.Sprintf("reservations/%s/reservationBlocks/%s", reservation, block))
	req := &computepb.GetReservationSubBlockRequest{
		Project:             reservationProject,
		Zone:                zone,
		ParentName:          parentName,
		ReservationSubBlock: subBlockName,
	}

	response, err := ga.reservationSubBlocksClient.Get(ctx, req)

the url sent was:

2026/02/13 11:13:55 INFO gcp sdk http response method=GET url=https://compute.googleapis.com/compute/v1/projects/xxx/zones/xxx/reservations%252Fxxx%252FreservationBlocks%252Fxxx/reservationSubBlocks/xxx status_code=200

[diviner524]

@mingkang111 Yes, what you described was the reservationSubBlocks API issue I mentioned, which required the forward slash to be encoded in the URL example as you shared.

This issue has been fixed, and you can now send the URL as is, without adding the %252F in your example.