Kebijakan Apigee dapat mengubah format pesan, menerapkan kontrol akses, memanggil layanan jarak jauh, mengizinkan pengguna, memeriksa konten pesan untuk mendeteksi potensi ancaman, dan melakukan banyak hal lainnya. Untuk mengetahui informasi selengkapnya, lihat Apa itu kebijakan?
Endpoint proxy dan target menentukan pipeline untuk pemrosesan pesan permintaan dan respons yang disebut sebagai alur permintaan dan respons. Alur adalah tahap berurutan di sepanjang jalur pemrosesan permintaan API. Kebijakan dilampirkan di berbagai titik dalam alur pesan permintaan dan respons sebagai langkah pemrosesan.
Pada langkah-langkah berikut, Anda akan membuat kebijakan baru dan melampirkannya ke proxy API dalam alur respons PreFlow untuk memastikan kebijakan diterapkan sebelum pemrosesan lainnya dilakukan. Kebijakan XMLtoJSON yang digunakan dalam tutorial ini mengonversi payload pesan respons API dari XML ke JSON.
Buat kebijakan XMLtoJSON.
Perluas paket proxy API helloworld, arahkan kursor ke folder policies, lalu klik .
Wizard Buat kebijakan akan terbuka.
Pilih Mediasi sebagai kategori kebijakan.
Pilih XML to JSON sebagai jenis kebijakan.
Masukkan XMLtoJSON sebagai nama kebijakan, lalu klik Enter.
Kebijakan ditambahkan ke folder /policies untuk proxy API dan dibuka di editor.
Klik XMLtoJSON.xml untuk mengedit kebijakan. Tetapkan elemen <OutputVariable> dan <Source> ke response, lalu simpan perubahan Anda.
[[["Mudah dipahami","easyToUnderstand","thumb-up"],["Memecahkan masalah saya","solvedMyProblem","thumb-up"],["Lainnya","otherUp","thumb-up"]],[["Sulit dipahami","hardToUnderstand","thumb-down"],["Informasi atau kode contoh salah","incorrectInformationOrSampleCode","thumb-down"],["Informasi/contoh yang saya butuhkan tidak ada","missingTheInformationSamplesINeed","thumb-down"],["Masalah terjemahan","translationIssue","thumb-down"],["Lainnya","otherDown","thumb-down"]],["Terakhir diperbarui pada 2025-09-04 UTC."],[[["\u003cp\u003eThis tutorial focuses on Apigee and Apigee hybrid, and it demonstrates how to attach a policy to an API proxy.\u003c/p\u003e\n"],["\u003cp\u003eApigee policies are used to transform messages, enforce access, call services, authorize users, and more, and they are attached at different steps in request and response flows.\u003c/p\u003e\n"],["\u003cp\u003eYou can create an XMLtoJSON policy to convert API response payloads from XML to JSON format by selecting it from the Mediation category in the Create Policy wizard, and then configure its output and source.\u003c/p\u003e\n"],["\u003cp\u003eAttaching the XMLtoJSON policy to the \u003ccode\u003ePreFlow\u003c/code\u003e response flow ensures that it is applied before other processing, and this is done by adding a \u003ccode\u003e<Step>\u003c/code\u003e element in the proxy's configuration file.\u003c/p\u003e\n"],["\u003cp\u003eAfter attaching the policy and redeploying, you can test the changes by calling the API, which will now return a JSON response instead of XML, and the next step will involve deploying to an Apigee environment.\u003c/p\u003e\n"]]],[],null,["# Step 6: Attach a policy\n\n*This page\napplies to **Apigee** and **Apigee hybrid**.*\n\n\n*View [Apigee Edge](https://docs.apigee.com/api-platform/get-started/what-apigee-edge) documentation.*\n\n\u003cbr /\u003e\n\nApigee policies can transform message formats, enforce access control, call remote services, authorize users, examine message content for potential threats, and do much more. For more information, see [What's a policy?](/apigee/docs/api-platform/develop/policy-attachment-and-enforcement)\n\nProxy and target endpoints define a pipeline for request and response message processing referred to as request and response *flows* . Flows are sequential stages along the API request processing path. Policies are attached at different points in the request and response message flows as processing *steps*.\n\nIn the following steps, you create a new policy and attach it to your API proxy in the `PreFlow` response flow to ensure the policy is applied before any other processing takes place. The [XMLtoJSON policy](/apigee/docs/api-platform/reference/policies/xml-json-policy) used in this tutorial converts the payload of the API's response message from XML to JSON.\n\n1. Create an XMLtoJSON policy.\n 1. Expand the **helloworld** API proxy bundle, position your cursor over the **policies** folder, and click .\n\n The **Create policy** wizard opens.\n 2. Select **Mediation** as the policy category.\n 3. Select **XML to JSON** as the policy type.\n 4. Enter **XMLtoJSON** as the policy name and click **Enter** .\n\n The policy is added to the `/policies` folder for the API proxy and opened in the editor.\n 5. Click `XMLtoJSON.xml` to edit the policy. Set the `\u003cOutputVariable\u003e` and `\u003cSource\u003e` elements to `response` and save your changes. **Note** : You'll attach the policy to the **response** flow in the API proxy PreFlow in the next step. \n\n ```\n \u003c?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?\u003e\n \u003cXMLToJSON async=\"false\" continueOnError=\"false\" enabled=\"true\" name=\"XMLtoJSON\"\u003e\n \u003cDisplayName\u003eXMLtoJSON\u003c/DisplayName\u003e\n \u003cProperties/\u003e\n \u003cFormat\u003eyahoo\u003c/Format\u003e\n \u003cOutputVariable\u003eresponse\u003c/OutputVariable\u003e\n \u003cSource\u003eresponse\u003c/Source\u003e\n \u003c/XMLToJSON\u003e\n ```\n2. Attach the policy to the default proxy endpoint.\n 1. Expand the **proxies** folder in the **helloworld** API proxy bundle and click **default.xml** to open the file in the editor.\n 2. Add a `\u003cStep\u003e` element that references the **XMLtoJSON** policy to the `\u003cResponse\u003e` flow in the API proxy `\u003cPreFlow\u003e`: \n\n ```\n \u003cProxyEndpoint name=\"default\"\u003e\n \u003cPreFlow name=\"PreFlow\"\u003e\n \u003cRequest\u003e\n \u003cStep\u003e\n \u003cName\u003everify-api-key\u003c/Name\u003e\n \u003c/Step\u003e\n \u003cStep\u003e\n \u003cName\u003eremove-query-param-apikey\u003c/Name\u003e\n \u003c/Step\u003e\n \u003cStep\u003e\n \u003cName\u003eimpose-quota\u003c/Name\u003e\n \u003c/Step\u003e\n \u003c/Request\u003e\n \u003cResponse\u003e\n \u003cStep\u003e\n \u003cName\u003eXMLtoJSON\u003c/Name\u003e\n \u003c/Step\u003e\n \u003c/Response\u003e\n \u003c/PreFlow\u003e\n ...\n \u003c/ProxyEndpoint\u003e\n ```\n 3. Save your changes to the file.\n3. To redeploy the environment, position your cursor over the **dev** environment folder and click .\n\n4. When prompted to select a test bundle to export, click **Deploy without a test bundle** because the test bundle has already been exported.\n\n5. Call your API in the **Terminal** tab. \n\n ```\n curl 0:8998/helloworld?apikey=ZQA5euYtNeJ7ZCGCJMpvd6F2BZOmxOzY\n ```\n\n\n The XML response is converted to JSON, as follows: \n\n ```\n {\n \"root\": {\n \"city\": \"San Jose\",\n \"firstName\": \"John\",\n \"lastName\": \"Doe\",\n \"state\": \"CA\"\n }\n }\n ```\n\n**Congratulations!** You've successfully attached the XMLtoJSON policy to your API proxy!\n\nNext, you will deploy your API as an archive to an Apigee environment for integration testing and production release.\n\n\n[1](/apigee/docs/api-platform/local-development/vscode/tutorial-create-workspace)\n\n\n[2](/apigee/docs/api-platform/local-development/vscode/tutorial-create-proxy)\n\n\n[3](/apigee/docs/api-platform/local-development/vscode/tutorial-deploy)\n\n\n[4](/apigee/docs/api-platform/local-development/vscode/tutorial-test)\n\n\n[5](/apigee/docs/api-platform/local-development/vscode/tutorial-change-target-endpoint)\n\n\n[6](/apigee/docs/api-platform/local-development/vscode/tutorial-attach-policy)\n\n\n[(NEXT) Step 7: Deploy to an Apigee environment](/apigee/docs/api-platform/local-development/vscode/tutorial-deploy-apigee)\n\n\n[8](/apigee/docs/api-platform/local-development/vscode/tutorial-promote)\n\n\u003cbr /\u003e"]]
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