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fix: use project-scoped Vertex URL for SA JSON auth and add ?alt=sse for streaming (closes #388)

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When using SA JSON + Bearer token, Vertex AI requires a project-scoped URL.
The old code used the global publishers endpoint which only works with a raw API key,
causing RESOURCE_PROJECT_INVALID errors.

Changes in open-sse/executors/vertex.js buildUrl():
- SA JSON path: projects/{projectId}/locations/{location}/publishers/google/models/{model}:{action}
- Appends ?alt=sse for streaming on SA JSON path
- Location defaults to us-central1, overridable via providerSpecificData.location
- Raw API key path unchanged (global publishers + ?key= param)

Co-authored-by: anuragg-saxenaa <anuragg.saxenaa@gmail.com>
Made-with: Cursor
This commit is contained in:
anuragg-saxenaa
2026-03-27 11:01:47 +07:00
committed by decolua
parent 5abf7102c0
commit f05d64e073
1 changed files with 15 additions and 6 deletions
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21
open-sse/executors/vertex.js
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@@ -53,13 +53,22 @@ export class VertexExecutor extends BaseExecutor {
return rawKey ? `${url}?key=${rawKey}` : url;
}
// Gemini on Vertex: always use global publishers endpoint
// ?alt=sse is required for proper SSE streaming (matches every other Gemini executor)
const action = stream ? "streamGenerateContent?alt=sse" : "generateContent";
let url = `https://aiplatform.googleapis.com/v1/publishers/google/models/${model}:${action}`;
// Gemini on Vertex
const action = stream ? "streamGenerateContent" : "generateContent";
// rawKey goes as a query param; use & because ?alt=sse already starts the query string
if (rawKey) url += `&key=${rawKey}`;
if (saJson) {
// SA JSON + Bearer token: must use project-scoped path to avoid RESOURCE_PROJECT_INVALID
const location = credentials?.providerSpecificData?.location || "us-central1";
let url = `https://aiplatform.googleapis.com/v1/projects/${projectId}/locations/${location}/publishers/google/models/${model}:${action}`;
if (stream) url += "?alt=sse";
return url;
}
// Raw API key: use global publishers endpoint with ?key= param
// ?alt=sse is required for proper SSE streaming (matches every other Gemini executor)
let url = `https://aiplatform.googleapis.com/v1/publishers/google/models/${model}:${action}`;
if (stream) url += "?alt=sse";
if (rawKey) url += stream ? `&key=${rawKey}` : `?key=${rawKey}`;
return url;
}