App Engine サービス間や App Engine サービスと他のサービス（ Google Cloud サービスや外部アプリケーションなど）間での通信には、多様な方法を使用できます。
App Engine サービスと通信する最も簡単な方法は、URL にリソースの名前または ID を含めてターゲット設定した HTTP リクエストを送信することです。たとえば、該当する Google Cloud プロジェクト ID に加え、サービスまたはバージョンの ID を含めてターゲット設定できます。
[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-09-04 UTC。"],[[["\u003cp\u003eThe \u003ccode\u003eREGION_ID\u003c/code\u003e is a Google-assigned code based on the region selected during app creation, included in App Engine URLs for apps created after February 2020, but optional for older apps.\u003c/p\u003e\n"],["\u003cp\u003eApp Engine services can communicate via targeted HTTP requests using URLs that include resource IDs like service or version, and project IDs.\u003c/p\u003e\n"],["\u003cp\u003eData can be shared across databases, the App Engine app, or external applications, as explained in the "Understanding Data and File Storage" document.\u003c/p\u003e\n"],["\u003cp\u003eServices in the standard environment can use the URL Fetch API to pass requests between services and external endpoints, and can share a memcache instance or utilize Task Queues.\u003c/p\u003e\n"],["\u003cp\u003eCertain URL paths, such as those ending with \u003ccode\u003e/eventlog\u003c/code\u003e, starting with \u003ccode\u003e/_ah/\u003c/code\u003e, or some paths ending with \u003ccode\u003ez\u003c/code\u003e, are reserved and cannot be used.\u003c/p\u003e\n"]]],[],null,["# Communicating Between Your Services\n\n### Region ID\n\nThe \u003cvar translate=\"no\"\u003eREGION_ID\u003c/var\u003e is an abbreviated code that Google assigns\nbased on the region you select when you create your app. The code does not\ncorrespond to a country or province, even though some region IDs may appear\nsimilar to commonly used country and province codes. For apps created after\nFebruary 2020, \u003cvar translate=\"no\"\u003eREGION_ID\u003c/var\u003e`.r` is included in\nApp Engine URLs. For existing apps created before this date, the\nregion ID is optional in the URL.\n\nLearn more\n[about region IDs](/appengine/docs/legacy/standard/php/how-requests-are-routed#region-id). \nOK\n\nYou can use various methods to communicate between your App Engine\nservices or with other services, including Google Cloud services and\nexternal applications.\n\nThe simplest approach for communicating with your App Engine service is\nto send targeted HTTP requests, where the URL includes the name or ID of a\nresource. For example, you can include the ID of a service or version that you\nwant to target, in addition to the corresponding Google Cloud project ID: \n\n\n https://\u003cvar translate=\"no\"\u003eVERSION\u003c/var\u003e-dot-\u003cvar translate=\"no\"\u003eSERVICE\u003c/var\u003e-dot-\u003cvar translate=\"no\"\u003ePROJECT_ID\u003c/var\u003e.\u003cvar translate=\"no\"\u003e\u003ca href=\"#appengine-urls\" style=\"border-bottom: 1px dotted #999\" class=\"devsite-dialog-button\" data-modal-dialog-id=\"regional_url\" track-type=\"progressiveHelp\" track-name=\"modalHelp\" track-metadata-goal=\"regionalURL\"\u003eREGION_ID\u003c/a\u003e\u003c/var\u003e.r.appspot.com\n\nFor details about targeting your services, including how to define HTTPS URLs,\nsee [How Requests are\nRouted](/appengine/docs/legacy/standard/php/how-requests-are-routed).\nTo authorize the requests between your services and other Google Cloud\nservices, see [Setting Up Authentication for Server to Server Production\nApplications](/docs/authentication/production).\n\nTo share data across databases and your App Engine app or some other\nexternal application, see\n\n[Understanding Data and File\nStorage](/appengine/docs/legacy/standard/php/storage).\n\n\nIn the standard environment, you can also pass requests between services and\nfrom services to external endpoints using the\n[URL Fetch](/appengine/docs/legacy/standard/php/issue-requests) API.\n\nAdditionally, services in the standard environment that reside within the same\nGoogle Cloud project can also use one of the App Engine APIs for the\nfollowing tasks:\n\n- Share a single [memcache](/appengine/docs/legacy/standard/php/memcache) instance.\n- Collaborate by assigning work between services through [Task Queues](/appengine/docs/legacy/standard/php/taskqueue).\n\nReserved URL paths\n------------------\n\nIt is not possible to use the following URL paths:\n\n- Paths ending with `/eventlog`\n- Paths starting with `/_ah/`\n- Some paths ending with `z`"]]
