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This page handles FAQ answers that are a work in progress.

Table of Contents

Current FAQ

Updates

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How do I describe a service that uses GraphQL?

GraphQL is allowed using HTTP as the transport layer (i.e. using WS-Light binding in SWIM-SERV-018 TI Profile and bindings).

GraphQL is an example of message-oriented service design (as opposed to operation-oriented or resource-oriented service design).  For message-oriented services, the essential part is describing the data schema. GraphQL services do this in its own schema language “GraphQL Schema Language”.

-TBD-

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How do I document the HTTP error codes in my service description?

My service relies on the standard HTTP error codes. Is there a need to document them in the service description?

The Examples/Notes section of requirement SWIM-SERV-220 Service behaviour explains that error messages and error handling in general can be included in a model view (as part of SWIM-SERV-330 Model view). They are modelled as part of the detailed service behaviour.

However, it is possible to add an entry in the service behaviour section of a service description. For example:

exception handling

The following error codes are used:

400 Bad Request: Indicated for malformed requests on the part of the client.

401 Unauthorized: Indicated for authentication errors (e.g. the authentication is not provided, the credentials used do not exists, the authentication mechanism used is not valid…).

403 Forbidden: Indicated for authorization errors (e.g. the authenticated credentials are not allowed to perform this operation on the resource).

404 Not Found: The requested resource cannot be found (e.g. the <subscription_id> does not exist).

405 Method Not Allowed: The HTTP method used is not supported by the resource.

500 Internal Server Error: Catch-all error for unexpected internal errors during the processing of the request.

Other error messages are documented in SWIM-SERV-280 Service messages.