fix(httpapi): pagination Link header echoes request host (#25527)

packages/opencode/src/server/routes/instance/httpapi/handlers/session.ts

@@ -18,7 +18,7 @@ import { Todo } from "@/session/todo"
 import { MessageID, PartID, SessionID } from "@/session/schema"
 import { NotFoundError } from "@/storage/storage"
 import { NamedError } from "@opencode-ai/core/util/error"
-import { Cause, Effect, Schema, Scope } from "effect"
+import { Cause, Effect, Option, Schema, Scope } from "effect"
 import * as Stream from "effect/Stream"
 import { HttpServerRequest, HttpServerResponse } from "effect/unstable/http"
 import { HttpApiBuilder, HttpApiError, HttpApiSchema } from "effect/unstable/httpapi"
@@ -125,7 +125,9 @@ export const sessionHandlers = HttpApiBuilder.group(InstanceHttpApi, "session",
           if (!page.cursor) return page.items
 
           const request = yield* HttpServerRequest.HttpServerRequest
-          const url = new URL(request.url, "http://localhost")
+          // toURL() honors the Host + x-forwarded-proto headers, so the Link
+          // header echoes the real origin instead of a hard-coded localhost.
+          const url = Option.getOrElse(HttpServerRequest.toURL(request), () => new URL(request.url, "http://localhost"))
           url.searchParams.set("limit", ctx.query.limit.toString())
           url.searchParams.set("before", page.cursor)
           return HttpServerResponse.jsonUnsafe(page.items, {