選擇性要求標頭
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
在要求方法中使用任何選用欄位時，要求訊息必須在方法外部建構，並以單一參數的形式傳入。
選用要求標頭 (例如 GoogleAdsService.Search 方法中的 validate_only 標頭) 不會以關鍵字參數的形式出現在方法簽章中，因此必須直接在要求訊息中設定。
如要判斷要求物件欄位是必要還是選用，請參閱服務的 protobuf 定義，並尋找包含 [(google.api.field_behavior) =
REQUIRED] 註解的欄位。
以下範例會在 GoogleAdsService.Search 請求中設定選用的 validate_only 欄位：
request = client.get_type("SearchGoogleAdsRequest")
request.customer_id = customer_id
request.query = query
request.validate_only = True
response = googleads_service.search(request=request)
除非另有註明，否則本頁面中的內容是採用創用 CC 姓名標示 4.0 授權，程式碼範例則為阿帕契 2.0 授權。詳情請參閱《Google Developers 網站政策》。Java 是 Oracle 和/或其關聯企業的註冊商標。
上次更新時間：2025-08-27 (世界標準時間)。
[null,null,["上次更新時間：2025-08-27 (世界標準時間)。"],[[["\u003cp\u003eWhen using optional fields in Google Ads API requests, construct the request message separately and pass it as a single parameter to the method.\u003c/p\u003e\n"],["\u003cp\u003eOptional request headers like \u003ccode\u003evalidate_only\u003c/code\u003e are set directly on the request message, not as keyword parameters in the method signature.\u003c/p\u003e\n"],["\u003cp\u003eYou can identify required or optional request fields by checking the protobuf definitions and looking for the \u003ccode\u003e[(google.api.field_behavior) = REQUIRED]\u003c/code\u003e annotation.\u003c/p\u003e\n"],["\u003cp\u003eTo use optional fields, create an instance of the request message type, populate its fields including the optional ones, and then pass it to the API method.\u003c/p\u003e\n"]]],[],null,["# Optional request headers\n\nWhen using any\n[optional fields](//protobuf.dev/programming-guides/proto3/#field-labels) on a\nrequest method, the request message must be constructed outside of the\nmethod and passed in as a single parameter.\n\nOptional request headers, for example the\n[`validate_only`](/google-ads/api/reference/rpc/v21/SearchGoogleAdsRequest#validate_only) header in\nthe [`GoogleAdsService.Search`](/google-ads/api/reference/rpc/v21/GoogleAdsService/Search) method,\nare not present in the method signature as keyword parameters, so they must be\nset on the request message directly.\n\nTo determine if a request object field is required or optional, you can\nreference the [protobuf definitions for\nservices](//github.com/googleapis/googleapis/tree/master/google/ads/googleads/v21/services)\nand look for fields that contain the annotation `[(google.api.field_behavior) =\nREQUIRED]`.\n\nHere's an example that sets the optional `validate_only` field\non a [`GoogleAdsService.Search`](/google-ads/api/reference/rpc/v21/GoogleAdsService/Search) request: \n\n request = client.get_type(\"SearchGoogleAdsRequest\")\n request.customer_id = customer_id\n request.query = query\n request.validate_only = True\n\n response = googleads_service.search(request=request)"]]
