GCP Workflow: Handling http functions responses other than 200 - google-workflows

Question

When calling http endpoint in GCP workflow, only HttpStatus 200 is considered a success.
How to handle other Success Status codes? 201, 202, etc.
Example workflow from samples:
- readItem:
try:
call: http.get
args:
url: https://example.com/someapi
auth:
type: OIDC
result: APIResponse
except:
as: e
steps:
- knownErrors:
switch:
- condition: ${not("HttpError" in e.tags)}
next: connectionProblem
- condition: ${e.code == 404}
next: urlNotFound
- condition: ${e.code == 403}
next: authProblem
- UnhandledException:
raise: ${e}
- urlFound:
return: ${APIResponse.body}
- connectionProblem:
return: "Connection problem; check URL"
- urlNotFound:
return: "Sorry, URL wasn't found"
- authProblem:
return: "Authentication error"
If the api endpoint https://example.com/someapi returns anything other than a 200 status code the connectionProblem is invoked.
This is the same if its a GET or POST request.
What is the best way of handling this?

Answer 1

There is nothing referencing how to handle other 200s statuses in the documentation for Google Workflows so I assume this is not possible without treating them as errors.
This means that in order to do it you are going to need to add an extra step to deal with this status as an error handling strategy, like - condition: ${e.code == 201} for example.
Alternatively you could open a feature request in Google's Issue Tracker so that they can consider implementing different treatements of such status codes or at least so that this is touched on more details in the documentation.

Answer 2

At present response codes >= 400 and <= 599 are considered an error and will raise an exception. i.e. 200s are considered a success and will not.
Alternatively, if you want to trigger an exception handler for return codes in this range (or for any other reason), this can be done by adding an additional step to the try call, for example (illustration only):
main:
steps:
- getStuff:
try:
steps:
- callStep:
call: http.get
args:
url: <SOME URL>
result: r
- checkNotOK:
switch:
- condition: ${r.code == 202}
raise: ${r}
retry:
predicate: ${custom_predicate}
max_retries: 5
backoff:
initial_delay: 2
max_delay: 60
multiplier: 2
custom_predicate:
params: [e]
steps:
- what_to_repeat:
switch:
- condition: ${e.code == 202}
return: true
- otherwise:
return: false