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Facebook Component

Available as of Camel 2.12

The Facebook component provides access to all of the Facebook APIs accessible using Facebook4J. It allows producing messages to retrieve, add, and delete posts, likes, comments, photos, albums, videos, photos, checkins, locations, links, etc. It also supports APIs that allow polling for posts, users, checkins, groups, locations, etc.

Facebook requires the use of OAuth for all client application authentication. In order to use camel-facebook with your account, you'll need to create a new application within Facebook at https://developers.facebook.com/apps and grant the application access to your account. The Facebook application's id and secret will allow access to Facebook APIs which do not require a current user. A user access token is required for APIs that require a logged in user. More information on obtaining a user access token can be found at https://developers.facebook.com/docs/facebook-login/access-tokens/.

Maven users will need to add the following dependency to their pom.xml for this component:

URI format

FacebookComponent

The facebook component can be configured with the Facebook account settings below, which are mandatory. The values can be provided to the component using the bean property configuration of type org.apache.camel.component.facebook.config.FacebookConfiguration. The oAuthAccessToken option may be ommited but that will only allow access to application APIs.

You can also configure these options directly in an endpoint URI.

Option

Description

oAuthAppId

The application Id

oAuthAppSecret

The application Secret

oAuthAccessToken

The user access token

In addition to the above settings, non-mandatory options below can be used to configure the underlying Facebook4J runtime through either the component's configuration property or in an endpoint URI.

Option

Description

Default Value

oAuthAuthorizationURL

OAuth authorization URL

https://www.facebook.com/dialog/oauth

oAuthPermissions

Default OAuth permissions. Comma separeted permission names. See

https://developers.facebook.com/docs/reference/login/#permissions

for the detail

null

oAuthAccessTokenURL

OAuth access token URL

https://graph.facebook.com/oauth/access_token

debugEnabled

Enables deubg output. Effective only with the embedded logger

false

gzipEnabled

Use Facebook GZIP encoding

true

httpConnectionTimeout

Http connection timeout in milliseconds

20000

httpDefaultMaxPerRoute

HTTP maximum connections per route

2

httpMaxTotalConnections

HTTP maximum total connections

20

httpProxyHost

HTTP proxy server host name

null

httpProxyPassword

HTTP proxy server password

null

httpProxyPort

HTTP proxy server port

null

httpProxyUser

HTTP proxy server user name

null

httpReadTimeout

Http read timeout in milliseconds

120000

httpRetryCount

Number of HTTP retries

0

httpRetryIntervalSeconds

HTTP retry interval in seconds

5

httpStreamingReadTimeout

HTTP streaming read timeout in milliseconds

40000

jsonStoreEnabled

If set to true, raw JSON forms will be stored in DataObjectFactory

false

mbeanEnabled

If set to true, Facebook4J mbean will be registerd

false

prettyDebugEnabled

prettify JSON debug output if set to true

false

restBaseURL

API base URL

https://graph.facebook.com/

useSSL

Use SSL

true

videoBaseURL

Video API base URL

https://graph-video.facebook.com/

clientURL

Facebook4J API client URL

http://facebook4j.org/en/facebook4j-<version>.xml

clientVersion

Facebook4J client API version

1.1.12

Producer Endpoints:

Producer endpoints can use endpoint names and options from the table below. Endpoints can also use the short name without the get or search prefix, except checkin due to ambiguity between getCheckin and searchCheckin. Endpoint options that are not mandatory are denoted by [].

Producer endpoints can also use a special option *inBody* that in turn should contain the name of the endpoint option whose value will be contained in the Camel Exchange In message. For example, the facebook endpoint in the following route retrieves activities for the user id value in the incoming message body.

Any of the endpoint options can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelFacebook.option. For example, the userId option value in the previous route could alternately be provided in the message header CamelFacebook.userId. Note that the inBody option overrides message header, e.g. the endpoint option inBody=user would override a CamelFacebook.userId header.

Endpoints that return a String return an Id for the created or modified entity, e.g. addAlbumPhoto returns the new album Id. Endpoints that return a boolean, return true for success and false otherwise. In case of Facebook API errors the endpoint will throw a RuntimeCamelException with a facebook4j.FacebookException cause.

Endpoint

Short Name

Options

Body Type

Accounts

 

 

 

getAccounts

accounts

[reading],[userId]

facebook4j.ResponseList<facebook4j.Account>

Activities

 

 

 

getActivities

activities

[reading],[userId]

facebook4j.ResponseList<facebook4j.Activity>

Albums

 

 

 

addAlbumPhoto

addAlbumPhoto

albumId,source,[message]

String

commentAlbum

commentAlbum

albumId,message

String

createAlbum

createAlbum

albumCreate,[userId]

String

getAlbum

album

albumId,[reading]

facebook.Album

getAlbumComments

albumComments

albumId,[reading]

facebook4j.ResponseList<facebook4j.Comment>

getAlbumCoverPhoto

albumCoverPhoto

albumId

java.net.URL

getAlbumLikes

albumLikes

albumId,[reading]

facebook4j.ResponseList<facebook4j.Like>

getAlbumPhotos

albumPhotos

albumId,[reading]

facebook4j.ResponseList<facebook4j.Photos>

getAlbums

albums

[reading],[userId]

facebook4j.ResponseList<facebook4j.Album>

likeAlbum

likeAlbum

albumId

boolean

unlikeAlbum

unlikeAlbum

albumId

boolean

Checkins

 

 

 

checkin

checkin

checkinCreate,[userId]

String

commentCheckin

commentCheckin

checkinId,message

String

getCheckin

checkin

checkinId,[reading]

facebook4j.Checkin

getCheckinComments

checkinComments

checkinId,[reading]

facebook4j.ResponseList<facebook4j.Comment>

getCheckinLikes

checkinLikes

checkinId,[reading]

facebook4j.ResponseList<facebook4j.Like>

getCheckins

checkins

[reading],[userId]

facebook4j.ResponseList<facebook4j.Checkin>

likeCheckin

likeCheckin

checkinId

boolean

unlikeCheckin

unlikeCheckin

checkinId

boolean

Comments

 

 

 

deleteComment

deleteComment

commentId

boolean

getComment

comment

commentId

facebook4j.Comment

getCommentLikes

commentLikes

commentId,[reading]

facebook4j.ResponseList<facebook4j.Like>

likeComment

likeComment

commentId

boolean

unlikeComment

unlikeComment

commentId

boolean

Domains

 

 

 

getDomain

domain

domainId

facebook4j.Domain

getDomainByName

domainByName

domainName

facebook4j.Domain

getDomainsByName

domainsByName

domainNames

java.util.List<facebook4j.Domain>

Events

 

 

 

createEvent

createEvent

eventUpdate,[userId]

String

deleteEvent

deleteEvent

eventId

boolean

deleteEventPicture

deleteEventPicture

eventId

boolean

editEvent

editEvent

eventId,eventUpdate

boolean

getEvent

event

eventId,[reading]

facebook4j.Event

getEventFeed

eventFeed

eventId,[reading]

facebook4j.ResponseList<facebook4j.Post>

getEventPhotos

eventPhotos

eventId,[reading]

facebook4j.ResponseList<facebook4j.Photo>

getEventPictureURL

eventPictureURL

eventId,[size]

java.net.URL

getEvents

events

[reading],[userId]

facebook4j.ResponseList<facebook4j.Event>

getEventVideos

eventVideos

eventId,[reading]

facebook4j.ResponseList<facebook4j.Video>

getRSVPStatusAsInvited

rSVPStatusAsInvited

eventId,[userId]

facebook4j.ResponseList<facebook4j.RSVPStatus>

getRSVPStatusAsNoreply

rSVPStatusAsNoreply

eventId,[userId]

facebook4j.ResponseList<facebook4j.RSVPStatus>

getRSVPStatusInAttending

rSVPStatusInAttending

eventId,[userId]

facebook4j.ResponseList<facebook4j.RSVPStatus>

getRSVPStatusInDeclined

rSVPStatusInDeclined

eventId,[userId]

facebook4j.ResponseList<facebook4j.RSVPStatus>

getRSVPStatusInMaybe

rSVPStatusInMaybe

eventId,[userId]

facebook4j.ResponseList<facebook4j.RSVPStatus>

inviteToEvent

inviteToEvent

eventId,[userId],[userIds]

boolean

postEventFeed

postEventFeed

eventId,postUpdate

String

postEventLink

postEventLink

eventId,link,[message]

String

postEventPhoto

postEventPhoto

eventId,source,[message]

String

postEventStatusMessage

postEventStatusMessage

eventId,message

String

postEventVideo

postEventVideo

eventId,source,[title,description]

String

rsvpEventAsAttending

rsvpEventAsAttending

eventId

boolean

rsvpEventAsDeclined

rsvpEventAsDeclined

eventId

boolean

rsvpEventAsMaybe

rsvpEventAsMaybe

eventId

boolean

uninviteFromEvent

uninviteFromEvent

eventId,userId

boolean

updateEventPicture

updateEventPicture

eventId,source

boolean

Family

 

 

 

getFamily

family

[reading],[userId]

facebook4j.ResponseList<facebook4j.Family>

Favorites

 

 

 

getBooks

books

[reading],[userId]

facebook4j.ResponseList<facebook4j.Book>

getGames

games

[reading],[userId]

facebook4j.ResponseList<facebook4j.Game>

getInterests

interests

[reading],[userId]

facebook4j.ResponseList<facebook4j.Interest>

getMovies

movies

[reading],[userId]

facebook4j.ResponseList<facebook4j.Movie>

getMusic

music

[reading],[userId]

facebook4j.ResponseList<facebook4j.Music>

getTelevision

television

[reading],[userId]

facebook4j.ResponseList<facebook4j.Television>

Facebook Query Language (FQL)

 

 

 

executeFQL

executeFQL

query,[locale]

facebook4j.internal.org.json.JSONArray

executeMultiFQL

executeMultiFQL

queries,[locale]

java.util.Map<String,facebook4j.internal.org.json.JSONArray>

Friends

 

 

 

addFriendlistMember

addFriendlistMember

friendlistId,userId

boolean

createFriendlist

createFriendlist

friendlistName,[userId]

String

deleteFriendlist

deleteFriendlist

friendlistId

boolean

getBelongsFriend

belongsFriend

friendId,[reading],[userId]

facebook4j.ResponseList<facebook4j.Friend>

getFriendlist

friendlist

friendlistId,[reading]

facebook4j.FriendList

getFriendlistMembers

friendlistMembers

friendlistId

facebook4j.ResponseList<facebook4j.Friend>

getFriendlists

friendlists

[reading],[userId]

facebook4j.ResponseList<facebook4j.FriendList>

getFriendRequests

friendRequests

[reading],[userId]

facebook4j.ResponseList<facebook4j.FriendRequest>

getFriends

friends

[reading],[userId]

facebook4j.ResponseList<facebook4j.Friend>

getMutualFriends

mutualFriends

[friendUserId],[reading],[userId1,userId2]

facebook4j.ResponseList<facebook4j.Friend>

removeFriendlistMember

removeFriendlistMember

friendlistId,userId

boolean

Games

 

 

 

deleteAchievement

deleteAchievement

achievementURL,[userId]

boolean

deleteScore

deleteScore

[userId]

boolean

getAchievements

achievements

[reading],[userId]

facebook4j.ResponseList<facebook4j.Achievement>

getScores

scores

[reading],[userId]

facebook4j.ResponseList<facebook4j.Score>

postAchievement

postAchievement

achievementURL,[userId]

String

postScore

postScore

scoreValue,[userId]

String

Groups

 

 

 

getGroup

group

groupId,[reading]

facebook4j.Group

getGroupDocs

groupDocs

groupId,[reading]

facebook4j.ResponseList<facebook4j.GroupDoc>

getGroupFeed

groupFeed

groupId,[reading]

facebook4j.ResponseList<facebook4j.Post>

getGroupMembers

groupMembers

groupId,[reading]

facebook4j.ResponseList<facebook4j.GroupMember>

getGroupPictureURL

groupPictureURL

groupId

java.net.URL

getGroups

groups

[reading],[userId]

facebook4j.ResponseList<facebook4j.Group>

postGroupFeed

postGroupFeed

groupId,postUpdate

String

postGroupLink

postGroupLink

groupId,link,[message]

String

postGroupStatusMessage

postGroupStatusMessage

groupId,message

String

Insights

 

 

 

getInsights

insights

objectId,metric,[reading]

facebook4j.ResponseList<facebook4j.Insight>

Likes

 

 

 

getUserLikes

userLikes

[reading],[userId]

facebook4j.ResponseList<facebook4j.Like>

Links

 

 

 

commentLink

commentLink

linkId,message

String

getLink

link

linkId,[reading]

facebook4j.Link

getLinkComments

linkComments

linkId,[reading]

facebook4j.ResponseList<facebook4j.Comment>

getLinkLikes

linkLikes

linkId,[reading]

facebook4j.ResponseList<facebook4j.Like>

likeLink

likeLink

linkId

boolean

unlikeLink

unlikeLink

linkId

boolean

Locations

 

 

 

getLocations

locations

[reading],[userId]

facebook4j.ResponseList<facebook4j.Location>

Messages

 

 

 

getInbox

inbox

[reading],[userId]

facebook4j.InboxResponseList<facebook4j.Inbox>

getMessage

message

messageId,[reading]

facebook4j.Message

getOutbox

outbox

[reading],[userId]

facebook4j.ResponseList<facebook4j.Message>

getUpdates

updates

[reading],[userId]

facebook4j.ResponseList<facebook4j.Message>

Notes

 

 

 

commentNote

commentNote

noteId,message

String

createNote

createNote

subject,message,[userId]

String

getNote

note

noteId,[reading]

facebook4j.Note

getNoteComments

noteComments

noteId,[reading]

facebook4j.ResponseList<facebook4j.Comment>

getNoteLikes

noteLikes

noteId,[reading]

facebook4j.ResponseList<facebook4j.Like>

getNotes

notes

[reading],[userId]

facebook4j.ResponseList<facebook4j.Note>

likeNote

likeNote

noteId

boolean

unlikeNote

unlikeNote

noteId

boolean

Notifications

 

 

 

getNotifications

notifications

[includeRead],[reading],[userId]

facebook4j.ResponseList<facebook4j.Notification>

markNotificationAsRead

markNotificationAsRead

notificationId

boolean

Permissions

 

 

 

getPermissions

permissions

[userId]

java.util.List<facebook4j.Permission>

revokePermission

revokePermission

permissionName,[userId]

boolean

Photos

 

 

 

addTagToPhoto

addTagToPhoto

photoId,[toUserId],[toUserIds],[tagUpdate]

boolean

commentPhoto

commentPhoto

photoId,message

String

deletePhoto

deletePhoto

photoId

boolean

getPhoto

photo

photoId,[reading]

facebook4j.Photo

getPhotoComments

photoComments

photoId,[reading]

facebook4j.ResponseList<facebook4j.Comment>

getPhotoLikes

photoLikes

photoId,[reading]

facebook4j.ResponseList<facebook4j.Like>

getPhotos

photos

[reading],[userId]

facebook4j.ResponseList<facebook4j.Photo>

getPhotoURL

photoURL

photoId

java.net.URL

getTagsOnPhoto

tagsOnPhoto

photoId,[reading]

facebook4j.ResponseList<facebook4j.Tag>

likePhoto

likePhoto

photoId

boolean

postPhoto

postPhoto

source,[message],[place],[noStory],[userId]

String

unlikePhoto

unlikePhoto

photoId

boolean

updateTagOnPhoto

updateTagOnPhoto

photoId,[toUserId],[tagUpdate]

boolean

Pokes

 

 

 

getPokes

pokes

[reading],[userId]

facebook4j.ResponseList<facebook4j.Poke>

Posts

 

 

 

commentPost

commentPost

postId,message

String

deletePost

deletePost

postId

boolean

getFeed

feed

[reading],[userId]

facebook4j.ResponseList<facebook4j.Post>

getHome

home

[reading]

facebook4j.ResponseList<facebook4j.Post>

getLinks

links

[reading],[userId]

facebook4j.ResponseList<facebook4j.Link>

getPost

post

postId,[reading]

facebook4j.Post

getPostComments

postComments

postId,[reading]

facebook4j.ResponseList<facebook4j.Comment>

getPostLikes

postLikes

postId,[reading]

facebook4j.ResponseList<facebook4j.Like>

getPosts

posts

[reading],[userId]

facebook4j.ResponseList<facebook4j.Post>

getStatuses

statuses

[reading],[userId]

facebook4j.ResponseList<facebook4j.Post>

getTagged

tagged

[reading],[userId]

facebook4j.ResponseList<facebook4j.Post>

likePost

likePost

postId

boolean

postFeed

postFeed

postUpdate,[userId]

String

postLink

postLink

link,[message],[userId]

String

postStatusMessage

postStatusMessage

message,[userId]

String

unlikePost

unlikePost

postId

boolean

Questions

 

 

 

addQuestionOption

addQuestionOption

questionId,optionDescription

String

createQuestion

createQuestion

question,[options],[allowNewOptions],[userId]

String

deleteQuestion

deleteQuestion

questionId

boolean

getQuestion

question

questionId,[reading]

facebook4j.Question

getQuestionOptions

questionOptions

questionId,[reading]

facebook4j.ResponseList<facebook4j.Question.Option>

getQuestionOptionVotes

questionOptionVotes

questionId

facebook4j.ResponseList<facebook4j.QuestionVotes>

getQuestions

questions

[reading],[userId]

facebook4j.ResponseList<facebook4j.Question>

getSubscribedto

subscribedto

[reading],[userId]

facebook4j.ResponseList<facebook4j.Subscribedto>

getSubscribers

subscribers

[reading],[userId]

facebook4j.ResponseList<facebook4j.Subscriber>

Test Users

 

 

 

createTestUser

createTestUser

appId,[name],[userLocale],[permissions]

facebook4j.TestUser

deleteTestUser

deleteTestUser

testUserId

boolean

getTestUsers

testUsers

appId

java.util.List<facebook4j.TestUser>

makeFriendTestUser

makeFriendTestUser

testUser1,testUser2

boolean

Users

 

 

 

getMe

me

[reading]

facebook4j.User

getPictureURL

pictureURL

[size],[userId]

java.net.URL

getUser

user

userId,[reading]

facebook4j.User

getUsers

users

ids

java.util.List<facebook4j.User>

Videos

 

 

 

commentVideo

commentVideo

videoId,message

String

getVideo

video

videoId,[reading]

facebook4j.Video

getVideoComments

videoComments

videoId,[reading]

facebook4j.ResponseList<facebook4j.Comment>

getVideoCover

videoCover

videoId

java.net.URL

getVideoLikes

videoLikes

videoId,[reading]

facebook4j.ResponseList<facebook4j.Like>

getVideos

videos

[reading],[userId]

facebook4j.ResponseList<facebook4j.Video>

likeVideo

likeVideo

videoId

boolean

postVideo

postVideo

source,[title,description],[userId]

String

unlikeVideo

unlikeVideo

videoId

boolean

Search

 

 

 

search

search

query,[reading]

facebook4j.ResponseList<facebook4j.internal.org.json.JSONObject>

searchCheckins

checkins

[reading]

facebook4j.ResponseList<facebook4j.Checkin>

searchEvents

events

query,[reading]

facebook4j.ResponseList<facebook4j.Event>

searchGroups

groups

query,[reading]

facebook4j.ResponseList<facebook4j.Group>

searchLocations

locations

[center,distance],[reading],[placeId]

facebook4j.ResponseList<facebook4j.Location>

searchPlaces

places

query,[reading],[center,distance]

facebook4j.ResponseList<facebook4j.Place>

searchPosts

posts

query,[reading]

facebook4j.ResponseList<facebook4j.Post>

searchUsers

users

query,[reading]

facebook4j.ResponseList<facebook4j.User>

Consumer Endpoints:

Any of the producer endpoints that take a reading parameter can be used as a consumer endpoint. The polling consumer uses the since and until fields to get responses within the polling interval. In addition to other reading fields, an initial since value can be provided in the endpoint for the first poll.

Rather than the endpoints returning a List (or facebook4j.ResponseList) through a single route exchange, camel-facebook creates one route exchange per returned object. As an example, if "facebook://home" results in five posts, the route will be executed five times (once for each Post).

  1. URI Options #

Name

Type

Description

achievementURL

java.net.URL

The unique URL of the achievement

albumCreate

facebook4j.AlbumCreate

The facebook Album to be created

albumId

String

The album ID

allowNewOptions

boolean

True if allows other users to add new options

appId

String

The ID of the Facebook Application

center

facebook4j.GeoLocation

Location latitude and longitude

checkinCreate

facebook4j.CheckinCreate

The checkin to be created. Deprecated, instead create a Post with an attached location

checkinId

String

The checkin ID

commentId

String

The comment ID

description

String

The description text

distance

int

Distance in meters

domainId

String

The domain ID

domainName

String

The domain name

domainNames

String[]

The domain names

eventId

String

The event ID

eventUpdate

facebook4j.EventUpdate

The event to be created or updated

friendId

String

The friend ID

friendUserId

String

The friend user ID

friendlistId

String

The friend list ID

friendlistName

String

The friend list Name

groupId

String

The group ID

ids

String[]

The ids of users

includeRead

boolean

Enables notifications that the user has already read in addition to unread ones

link

java.net.URL

Link URL

linkId

String

The link ID

locale

java.util.Locale

Desired FQL locale

message

String

The message text

messageId

String

The message ID

metric

String

The metric name

name

String

Test user name, must be of the form 'first last'

noStory

boolean

If set to true, optionally suppresses the feed story that is automatically generated on a user’s profile when they upload a photo using your application.

noteId

String

The note ID

notificationId

String

The notification ID

objectId

String

The insight object ID

optionDescription

String

The question's answer option description

options

java.util.List<String>

The question's answer options

permissionName

String

The permission name

permissions

String

Test user permissions in the format perm1,perm2,...

photoId

String

The photo ID

place

String

The Facebook ID of the place associated with the Photo

placeId

String

The place ID

postId

String

The post ID

postUpdate

facebook4j.PostUpdate

The post to create or update

queries

java.util.Map<String>

FQL queries

query

String

FQL query or search terms for search* endpoints

question

String

The question text

questionId

String

The question id

reading

facebook4j.Reading

Optional reading parameters. See Reading Options(#reading)

scoreValue

int

The numeric score with value

size

facebook4j.PictureSize

The picture size, one of large, normal, small or square

source

facebook4j.Media

The media content from either a java.io.File or java.io.Inputstream

subject

String

The note of the subject

tagUpdate

facebook4j.TagUpdate

Photo tag information

testUser1

facebook4j.TestUser

Test user

testUser2

facebook4j.TestUser

Test user

testUserId

String

The ID of the test user

title

String

The title text

toUserId

String

The ID of the user to tag

toUserIds

java.util.List<String>

The IDs of the users to tag

userId

String

The Facebook user ID

userId1

String

The ID of a user

userId2

String

The ID of a user

userIds

String[]

The IDs of users to invite to event

userLocale

String

The test user locale

videoId

String

The video ID

Reading Options

The reading option of type facebook4j.Reading adds support for reading parameters, which allow selecting specific fields, limits the number of results, etc. For more information see Graph API - Facebook Developers.

It is also used by consumer endpoints to poll Facebook data to avoid sending duplicate messages across polls.

The reading option can be a reference or value of type facebook4j.Reading, or can be specified using the following reading options in either the endpoint URI or exchange header with CamelFacebook. prefix.

Option

Description

reading.fields

Field names to retrieve, in the format field1,field2,...

reading.limit

Limit for number of items to return for list results, e.g. a limit of 10 returns items 1 through 10

reading.offset

Starting offset for list results, e.g. a limit of 10, and offset of 10 returns items 11 through 20

reading.until

A Unix timestamp or strtotime data value that points to the end of the range of time-based data

reading.since

A Unix timestamp or strtotime data value that points to the start of the range of time-based data

reading.locale

Retrieve localized content in a particular locale, specified as a String with the format language[,country][,variant]

reading.with

Retrieve information about objects that have location information attached, set it to true

reading.metadata

Use Facebook Graph API Introspection to retrieve object metadata, set it to true

reading.filter

User's stream filter key. See Facebook stream_filter

Message header

Any of the URI options can be provided in a message header for producer endpoints with CamelFacebook. prefix.

Message body

All result message bodies utilize objects provided by the Facebook4J API. Producer endpoints can specify the option name for incoming message body in the inBody endpoint parameter.

For endpoints that return an array, or facebook4j.ResponseList, or java.util.List, a consumer endpoint will map every elements in the list to distinct messages.

Use cases

To create a post within your Facebook profile, send this producer a facebook4j.PostUpdate body.

To poll, every 5 sec., all statuses on your home feed:

Searching using a producer with dynamic options from header.

In the bar header we have the Facebook search string we want to execute in public posts, so we need to assign this value to the CamelFacebook.query header.

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