CODEWITHSUNDEEP
azure-logic-apps
epieters
epieters

Reputation: 1177

Is there an (easy) way to extract a substring from a HTTP Header Parameter?

I'm calling a rest api with pagination and in the response I get the "next" link in the HTTP Header, in the following format: Link <https://aaaaaa/bbb/ccc/ddd/version/2.1.1/locations/?date_from=1601-01-01T00%3a00%3a00Z&date_to=2019-04-24T17%3a03%3a29Z&offset=100&limit=100>; rel="next"

I can easily get the value of the HTTP Header link parameter

But there is no regex expression in Azure Logic Apps that I can use to further parse the link value in just the part between < and >

One option is to write an Azure Function that deals with this, but I'm looking for something simpler (if possible)

{
    "inputs": {
        "name": "newLink",
        "value": "@{outputs('HTTP')['headers']?['Link']}"
    }
}

the newLink variable now contains the complete value of link. But I need only the part between the < and the >

Any hints on how I can parse the newLink variable into what I need (without using azure functions) is highly appreciated.

Upvotes: 0

Views: 2710

Answers (1)

Ketan
Ketan

Reputation: 1550

You can use spilt() function as shown below:

@split(split(triggerOutputs()['headers']?['Link'],'<')[1],'>')[0]

Designer View

Designer

Code View

{
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {
            "Response": {
                "inputs": {
                    "body": "@split(split(triggerOutputs()['headers']?['Link'],'<')[1],'>')[0]",
                    "statusCode": 200
                },
                "kind": "Http",
                "runAfter": {},
                "type": "Response"
            }
        },
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {},
        "triggers": {
            "manual": {
                "inputs": {
                    "schema": {}
                },
                "kind": "Http",
                "type": "Request"
            }
        }
    }
}

Postman Call:

enter image description here

Upvotes: 5

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