Consuming REST Services

Liferay DXP contains REST services for most of its applications. These services are fully OpenAPI compliant. Here, learn how to consume them. This takes only three steps:

1. Identify the service you wish to consume.

2. Identify the site containing the data you need.

3. Make the service call using credentials that have access to the data.

This example uses Docker image with a fresh install of Liferay DXP.

Identify the Service to Consume

You need a running Liferay DXP to call its REST services.

Start a new Liferay instance by running

docker run -it -m 8g -p 8080:8080 liferay/portal:7.4.3.132-ga132

Sign in to Liferay at http://localhost:8080. Use the email address [e-mail] and the password test. When prompted, change the password to learn.

To view the various API endpoints, use your browser and access Liferay’s API Explorer at [server]:[port]/o/api. For example, in your Docker instance, you can find them here:

http://localhost:8080/o/api

APIs are divided into several categories. This example uses the BlogPosting service to retrieve blog posts from the Blogs widget, but you can use this procedure with any of the published services.

1. Select the Headless Delivery category. This category contains the BlogPosting service. You can use the filter to search for services.

2. Click the Show Schemas button, and on the right side of the screen a list of all the schemas in this category appears.

3. Keep a browser tab open to the schema browser; when you want to PUT a BlogPosting, use its schema.

Headless Action Keys

Each headless endpoint’s methods have headless action keys that identify the methods independently from the URL. These action keys are useful for connecting to the actions from other applications, such as data set actions.

You can find the action keys for a specific endpoint via the API Explorer. For your chosen endpoint (e.g., user accounts), execute a GET action. The server response JSON includes an actions block in the body, including each action key.

For example, here is a response showing the action keys for the /o/headless-admin-user/ endpoint (with the /v1.0/user-accounts/{userAccountId} GET method). The action keys shown include get-user-account-by-external-reference-code, put-user-account, etc.

REST Context Paths for Root Models

Liferay DXP 2024.Q3+/Portal GA125+

When working with object definitions related to modifiable system objects, the REST context path includes the root model’s path. This reflects the hierarchical relationship between models and helps organize API endpoints efficiently.

Note that some root models are grouped under a common namespace and must be preceded by a prefix representing that namespace. This prefix typically reflects the module or functional area of the system.

For example, the APIApplication root model is part of the API Builder component. All of its endpoints are found under the headless-builder prefix. Similarly, Commerce-related functionalities are under the headless-commerce-admin prefix.

You can find this information using Liferay’s API Explorer. Click on Rest Applications (1) in the top-right corner. The REST applications appear with their corresponding paths, including prefixes if applicable (2). You can confirm the path under Servers (3).

Example context paths:

• With a prefix:

  APIApplication is the root model and APIEndpoint is its descendant, making the REST endpoints

  For APIApplication: /headless-builder/application.

  For APIEndpoint: /headless-builder/applications/endpoints.

• Without a prefix:

  Some REST API endpoints are not grouped under a namespace and therefore don’t use prefixes.

  For example, CommerceReturn is the root model and CommerceReturnItem is its descendant, making the REST endpoints

  For CommerceReturn: /commerce-returns.

  For CommerceReturnItem: /commerce-returns/commerce-return/items.

The table below lists modifiable system objects and their corresponding REST context paths. Use this information to understand how to construct REST context paths when working with modifiable system objects.

Object Definition	REST Context Path
APIApplication	/headless-builder/applications
APIEndpoint	/headless-builder/endpoints
APIFilter	/headless-builder/filters
APIProperty	/headless-builder/properties
APISchema	/headless-builder/schemas
APISort	/headless-builder/sorts
Bookmark	/bookmarks
CommerceReturn	/commerce-returns
CommerceReturnItem	/commerce-return-items
FDSAction	/data-set-manager/actions
FDSCardsSection	/data-set-manager/cards-sections
FDSClientExtensionFilter	/data-set-manager/client-extension-filters
FDSDateFilter	/data-set-manager/date-filters
FDSDynamicFilter	/data-set-manager/dynamic-filters
FDSEntry	/data-set-manager/entries
FDSField	/data-set-manager/fields
FDSListSection	/data-set-manager/list-sections
FDSSort	/data-set-manager/sorts
FDSView	/data-set-manager/views
FunctionalCookieEntry	/functional-cookies-entries
NecessaryCookieEntry	/necessary-cookies-entries
PerformanceCookieEntry	/performance-cookies-entries
PersonalizationCookieEntry	/personalization-cookies-entries

Identify the Site Containing the Data

Now you must find the default Site ID:

1. Open the Site menu () and go to Configuration → Site Settings.

2. Under the Platform section, click Site Configuration. For Liferay DXP versions 7.3 and earlier, click the General tab.

3. Find the Site identifier under Site ID.

   

Make the Service Call Using Credentials with Access to the Data

Now you have everything needed to make the call. All web services must be accessed using credentials that grant access to the data you’re requesting. The simplest method is Basic Auth, which passes credential data in the URL. Since this method is insecure, use it only during development. For production, your application should authorize users via OAuth2.

The examples below use cURL.

Calling a Service Using Basic Auth (During Development Only)

To call a service using Basic Auth, provide the credentials in the URL:

curl "http://localhost:8080/o/headless-delivery/v1.0/sites/20122/blog-postings/" -u '[e-mail]:learn'

Calling a Service Using OAuth2

For production, create an OAuth2 application and use the OAuth2 process to get an authorization token. Once you have the token, provide it in the HTTP header:

curl -H "Authorization: Bearer d5571ff781dc555415c478872f0755c773fa159" http://localhost:8080/o/headless-delivery/v1.0/sites/20122/blog-postings

Getting and Posting Data

If you run the query above to get all blog postings, you see there aren’t any:

{
   "actions" : {
      "subscribe" : {
         "method" : "PUT",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/sites/{siteId}/blog-postings/subscribe"
      },
      "unsubscribe" : {
         "method" : "PUT",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/sites/{siteId}/blog-postings/unsubscribe"
      },
      "create" : {
         "method" : "POST",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/sites/{siteId}/blog-postings"
      }
   },
   "items" : [ ],
   "lastPage" : 1,
   "page" : 1,
   "pageSize" : 20,
   "totalCount" : 0
}

First, post a blog entry.

Posting a Blog Entry

You can use the schema browser to learn how to post a blog entry.

1. Go back to your browser tab containing the schema browser. On the right side, click the BlogPosting entry to display its schema (see above). This shows the whole data structure for a BlogPosting, but there are only two required fields:

   • articleBody
   • headline

2. Construct a simple JSON document to post a blog entry:

   {
      "headline": "Test Blog Entry from REST Services",
      "articleBody": "This article was posted via REST services provided by Liferay DXP."
   }
   

3. Make the request:

   curl --header "Content-Type: application/json" --request POST --data '{ "headline": "Test Blog Entry from REST Services", "articleBody": "This article was posted via REST services provided by Liferay DXP." }' http://localhost:8080/o/headless-delivery/v1.0/sites/20122/blog-postings -u [e-mail]:learn
   

Liferay DXP returns the full JSON representation of your blog entry:

{
   "actions" : {
      "get" : {
         "method" : "GET",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
      },
      "replace" : {
         "method" : "PUT",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
      },
      "update" : {
         "method" : "PATCH",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
      },
      "delete" : {
         "method" : "DELETE",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
      }
   },
   "alternativeHeadline" : "",
   "articleBody" : "This article was posted via REST services provided by Liferay DXP.",
   "creator" : {
      "additionalName" : "",
      "contentType" : "UserAccount",
      "familyName" : "Test",
      "givenName" : "Test",
      "id" : 20125,
      "name" : "Test Test",
      "profileURL" : "/web/test"
   },
   "customFields" : [ ],
   "dateCreated" : "2020-03-06T18:02:26Z",
   "dateModified" : "2020-03-06T18:02:27Z",
   "datePublished" : "2020-03-06T18:02:00Z",
   "description" : "",
   "encodingFormat" : "text/html",
   "friendlyUrlPath" : "test-blog-entry-from-rest-services",
   "headline" : "Test Blog Entry from REST Services",
   "id" : 35215,
   "keywords" : [ ],
   "numberOfComments" : 0,
   "relatedContents" : [ ],
   "siteId" : 20122,
   "taxonomyCategories" : [ ]
}

Getting All Blog Entries

Now you can repeat the first query you did to see that the blog entry you posted is there:

curl "http://localhost:8080/o/headless-delivery/v1.0/sites/20122/blog-postings/" -u '[e-mail]:learn'

This returns a list of blog entries. The entry you added is the only one in the list:

{
   "actions" : {
      "subscribe" : {
         "method" : "PUT",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/sites/{siteId}/blog-postings/subscribe"
      },
      "unsubscribe" : {
         "method" : "PUT",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/sites/{siteId}/blog-postings/unsubscribe"
      },
      "create" : {
         "method" : "POST",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/sites/{siteId}/blog-postings"
      }
   },
   "items" : [ {
      "actions" : {
         "get" : {
         "method" : "GET",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
         },
         "replace" : {
         "method" : "PUT",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
         },
         "update" : {
         "method" : "PATCH",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
         },
         "delete" : {
         "method" : "DELETE",
         "href" : "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/{blogPostingId}"
         }
      },
      "alternativeHeadline" : "",
      "articleBody" : "This article was posted via REST services provided by Liferay DXP.",
      "creator" : {
         "additionalName" : "",
         "contentType" : "UserAccount",
         "familyName" : "Test",
         "givenName" : "Test",
         "id" : 20125,
         "name" : "Test Test",
         "profileURL" : "/web/test"
      },
      "customFields" : [ ],
      "dateCreated" : "2020-03-06T18:02:26Z",
      "dateModified" : "2020-03-06T18:02:27Z",
      "datePublished" : "2020-03-06T18:02:00Z",
      "description" : "",
      "encodingFormat" : "text/html",
      "friendlyUrlPath" : "test-blog-entry-from-rest-services",
      "headline" : "Test Blog Entry from REST Services",
      "id" : 35215,
      "keywords" : [ ],
      "numberOfComments" : 0,
      "relatedContents" : [ ],
      "siteId" : 20122,
      "taxonomyCategories" : [ ]
   } ],
   "lastPage" : 1,
   "page" : 1,
   "pageSize" : 20,
   "totalCount" : 1
}

Getting a Single Blog Entry

Each time you’ve made a request, Liferay DXP has returned other possible endpoints. One of these is to get a single blog entry by its ID. If you know your entry’s ID, you can retrieve it:

curl "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/35215" -u [e-mail]:learn

This returns the same blog entry.

Deleting a Blog Entry

If you know its ID, you can also delete your blog entry:

curl -X DELETE "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/35215" -u [e-mail]:learn

In this case, nothing is returned, but you can verify your entry is gone by requesting it as you did above:

curl "http://localhost:8080/o/headless-delivery/v1.0/blog-postings/35215" -u [e-mail]:learn

Liferay DXP then returns this JSON document in response:

{
  "status" : "NOT_FOUND",
  "title" : "No BlogsEntry exists with the primary key 35215"
}

Congratulations! You’ve now learned how to call Liferay DXP’s REST services. Remember that the examples above use Basic Auth: for production, use OAuth2 to call services in a secure way.

Related Topics

• Consuming GraphQL APIs
• API Headers Reference