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Subscribe operation

The Subscribe operation is used to subscribe client applications to either push or pull notifications. It is important to be aware that the structure of the request messages and responses is different depending on the type of event notification.

Pull Subscription Subscribe request example

Description

The following code example shows how to subscribe to a pull event notification subscription. The subscription informs the client application if new mail is added to the Inbox and if an item is deleted from the Inbox. The subscription will time out if the client does not request information about events within ten minutes. If the subscription expires, a new subscription must be established to continue to request notifications.

Code

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
  xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
  <soap:Body>
    <Subscribe xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">
      <PullSubscriptionRequest>
        <t:FolderIds>
          <t:DistinguishedFolderId Id="inbox"/>
        </t:FolderIds>
        <t:EventTypes>
          <t:EventType>NewMailEvent</t:EventType>
          <t:EventType>DeletedEvent</t:EventType>
        </t:EventTypes>
        <t:Timeout>10</t:Timeout>
      </PullSubscriptionRequest>
    </Subscribe>
  </soap:Body>
</soap:Envelope>

Pull Subscription Subscribe Request Elements

The following elements are used in the request:

To find other options for the request message of the Subscribe operation, explore the schema hierarchy. Start at the PullSubscriptionRequest element.

Successful Pull Subscription Subscribe response example

Description

The following example shows a successful pull subscription response. The response contains the subscription identifier and watermark that is used to get the array of events that are associated with a subscription. The subscription identifier is also used to unsubscribe a client from a subscription.

Code

<?xml version="1.0" encoding="utf-8" ?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" 
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
               xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Header>
    <t:ServerVersionInfo MajorVersion="8" MinorVersion="0" MajorBuildNumber="628" MinorBuildNumber="0" 
                         xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" />
  </soap:Header>
  <soap:Body>
    <SubscribeResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" 
                       xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" 
                       xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">
      <m:ResponseMessages>
        <m:SubscribeResponseMessage ResponseClass="Success">
          <m:ResponseCode>NoError</m:ResponseCode>
          <m:SubscriptionId>39ea5d0f-f062-455e-a1e9-89c0304390f4</m:SubscriptionId>
          <m:Watermark>AAAAAHgGAAAAAAAAAQ==</m:Watermark>
        </m:SubscribeResponseMessage>
      </m:ResponseMessages>
    </SubscribeResponse>
  </soap:Body>
</soap:Envelope>

Pull Subscription Subscribe response elements

The following elements are used in the response:

Pull Subscription Subscribe Error response example

Description

The following example shows an error response to a Subscribe request. The error is caused by an attempt to subscribe to notifications by using delegate access.

Code

<?xml version="1.0" encoding="utf-8" ?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" 
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
               xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Header>
    <t:ServerVersionInfo MajorVersion="8" MinorVersion="0" MajorBuildNumber="685" MinorBuildNumber="8" 
                         xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" />
  </soap:Header>
  <soap:Body>
    <SubscribeResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" 
                       xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" 
                       xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">
      <m:ResponseMessages>
        <m:SubscribeResponseMessage ResponseClass="Error">
          <m:MessageText>Subscriptions are not supported for delegate user access.</m:MessageText>
          <m:ResponseCode>ErrorSubscriptionDelegateAccessNotSupported</m:ResponseCode>
          <m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
        </m:SubscribeResponseMessage>
      </m:ResponseMessages>
    </SubscribeResponse>
  </soap:Body>
</soap:Envelope>

Pull Subscription Error response elements

The following elements are used in the error response:

Push Subscription request example

Description

The following code example shows how to subscribe to a push event notification subscription. The request identifies the folders to monitor, the types of events to monitor, the frequency of status notifications, and the URL of the client Web service that listens for the push notifications.

Code

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
               xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
  <soap:Body>
    <Subscribe xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
               xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <PushSubscriptionRequest xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">
        <FolderIds xmlns="http://schemas.microsoft.com/exchange/services/2006/types">
          <DistinguishedFolderId Id="inbox" />
        </FolderIds>
        <EventTypes xmlns="http://schemas.microsoft.com/exchange/services/2006/types">
          <EventType>NewMailEvent</EventType>
          <EventType>CopiedEvent</EventType>
          <EventType>CreatedEvent</EventType>
          <EventType>DeletedEvent</EventType>
          <EventType>ModifiedEvent</EventType>
          <EventType>MovedEvent</EventType>
        </EventTypes>
        <StatusFrequency xmlns="http://schemas.microsoft.com/exchange/services/2006/types">1</StatusFrequency>
        <URL xmlns="http://schemas.microsoft.com/exchange/services/2006/types">http://clientWebService/Service.asmx</URL>
      </PushSubscriptionRequest>
    </Subscribe>
  </soap:Body>
</soap:Envelope>

Comments

The client Web service must be set up before the push notification subscribe request is sent; otherwise, the first notification will not be sent to a valid endpoint and the push notification will fail. For more information, see Push Notification Sample Application.

A new SubscriptionId (GetEvents) is created when you resubscribe. Use the watermark of a previous subscription to resubscribe at the point where the previous subscription ended.

Push Subscription Request Elements

The following elements are used in the request:

Successful Push Subscription response example

Description

The following example shows a successful push subscription response.

Code

<?xml version="1.0" encoding="utf-8" ?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" 
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
               xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Header>
    <t:ServerVersionInfo MajorVersion="8" MinorVersion="0" MajorBuildNumber="628" MinorBuildNumber="0" 
                         xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" />
  </soap:Header>
  <soap:Body>
    <SubscribeResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" 
                       xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" 
                       xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">
      <ResponseMessages>
        <SubscribeResponseMessage ResponseClass="Success">
          <ResponseCode>NoError</ResponseCode>
          <SubscriptionId>83826921-afdf-48be-b469-628cc02b5f49</SubscriptionId>
          <Watermark>AQAAAOpvG0LURVdOhQkPOWZLPcI8EgAAAAAAAAE=</Watermark>
        </SubscribeResponseMessage>
      </ResponseMessages>
    </SubscribeResponse>
  </soap:Body>
</soap:Envelope>

Push Subscription response elements

The following elements are used in the response:

See also

Unsubscribe operation

GetEvents operation

Using Pull Subscriptions

Push Notification Sample Application