SOAP Web Service
The SOAP Web Services provided by ServiceNow are WS-I compliant, as outlined in the WS-I Basic Profile 1.0.
2 Concepts and Terminology
- Provider - publishes web service for clients to invoke (consume)
- Consumer - invokes / consumes published web service
- Web Service Description Language
- XML document describing functions, arguments, data schema, and endpoint (where / how to invoke the service, URL)
- WSDL only necessary when generating SOAP envelope programmatically
- Simple Object Access Protocol
- XML document usually HTTP posted to web service endpoint described in WSDL
- SOAP:Envelope / SOAP:Header / SOAP:Body
- Hyper-Text Transfer Protocol
- POST vs GET - Web Service is POSTed
- XML vs. Form POST - Web Service is XML
2.1 Web Service Provider
ServiceNow publishes its underlying table structures and associated data with the following Web Service methods:
- Direct Web Services: Use a URL query to request a ServiceNow table's WSDL.
- Web Service Import Sets: Use import tables and transform maps to automate Web Service requests to ServiceNow tables.
|Note: SOAP messages are sent with the assumption that the recipient is XML compliant. No encoding is applied to the SOAP message.|
2.2 Web Service Consumer
All ServiceNow tables and import sets dynamically generate WSDL XML documents that describe its table schema and available operations. You can get a WSDL format by issuing a URL targeting a ServiceNow table with the WSDL parameter, for example:
All dynamically generated and served ServiceNow WSDL accessible via HTTP is available for use under the terms defined in the Open Source Initiative OSI - Apache License, Version 2.0 license agreement.
|OSI - Apache License, Version 2.0|
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4 Direct Web Services
A SOAP direct web service is available for any table in the system provided the correct access control is setup. The supported format of the incoming message is document style literal XML SOAP documents (Document/Literal). To retrieve the direct web service WSDL description and XML schema, point to the relative URL of <tablename>.do?WSDL. For example, to retrieve the WSDL for the Incident table on the online demo system, use the following URL:
- https://<instance name>.service-now.com/incident.do?WSDL
5 Web Service Import Sets
Web Service Import Sets provide a web service interface to import set tables. This type of web service will transform the incoming data synchronously based on the associated transform maps by default.
6 SOAP Roles
To use SOAP web services, you must have the appropriate role for the operation you want to perform. Additionally, you must have any other roles required to access the target tables.
|soap||Can perform all SOAP operations.|
|soap_create||Can insert new records.|
|soap_delete||Can delete existing records.|
|soap_ecc||Can query, insert, and delete records on the Queues [ecc_queue] table.|
|soap_query||Can query record information.|
|soap_query_update||Can query record information and update records.|
|soap_script||Can run scripts that specify a .do endpoint. This role is required for running Scripted Web Services.|
|soap_update||Can update records.|
7 Overriding the SOAP Endpoint
The SOAP End-point address (where the SOAP message is posted) is consistent with the endpoint of the WSDL. In some cases, however, the WSDL may reference an incorrect endpoint URL. If this happens, it is necessary to over-ride the generated URL by creating the property com.glide.soap_address_base_url to contain the new URL. You may have to add the property manually as this is not an out-of-box property.
For instance, a generated SOAP Endpoint may look like this:
You can specify a property to define the endpoint such that it goes through a proxy by setting the property:
com.glide.soap_address_base_url = "https://myproxy.mycompany.com/service-now/"
This will result in the endpoint being generated to appear as:
8 Enabling HTTP Compression
By default, the SOAP request is accepted un-compressed and the result of the request is returned un-compressed. To enable HTTP compression using [gzip] when sending in your SOAP request, set the following HTTP header:
To receive the SOAP response compressed using [gzip] send in your SOAP request with the following HTTP header:
9 Debugging Incoming SOAP Envelope
To capture incoming SOAP envelope XML in the system log, add the property glide.processor.debug.SOAPProcessor with a value of true.
When enabled, this property adds the incoming SOAP envelope in the Message field of the system log. Disable this debugging feature as soon as you are finished so that the log is not overwhelmed with excessive and unnecessary debugging information.
10 Preventing Empty Elements in SOAP Messages
By default, ServiceNow does not omit empty elements, elements with NULL or NIL values, from SOAP messages.
To prevent SOAP responses from containing empty elements, an administrator can create a system property called glide.soap.omit_null_values and set the value to true. This behavior is compliant with the WSDL as all elements in a SOAP message have a minOccurs=0 attribute and are therefore optional. In addition, this behavior prevents the instance from creating inefficient SOAP messages containing a large number of empty elements.
Set this property to false to allow SOAP messages to search for existing fields with empty values. For example, if an administrator wants to search for incidents with an empty Assigned to field from a SOAP message, then the SOAP message must be able to send an empty value for this field.
|Note: Changing the value of this property may cause unintended actions in existing web service integrations. Administrators are strongly encouraged to carefully test the new behavior to ensure that existing integrations process empty elements as expected.|
- The property glide.soap.request_processing_timeout has a default value of 60 seconds.