Workflow step fails if workflow is triggered with a specific user agent string

[priyaaank]

Describe the bug
When the initial workflow is called with following header and value, then the parsing before the first step fails.
Header name: User-Agent
Header value: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101 Firefox/16.0

To Reproduce
Steps to reproduce the behavior:

1. Create any workflow
2. Trigger workflow and ensure that above specified header is part of the trigger request
3. Check the service request status

Expected behavior
Expected to see a successful execution of the step

Screenshots/Logs
However, this is the error I see

{
    "service_request_id": "a28ad6ed-1101-4909-9132-54ecf08622ba",
    "workflow_name": "benchmarking_http_services_flow",
    "status": "FAILED",
    "total_time_in_ms": 3,
    "steps": [
        {
            "id": 1,
            "name": "benchmarking step one",
            "status": "STARTED",
            "time_taken": 0,
            "payload": {
                "request": null,
                "response": null
            }
        },
        {
            "id": 1,
            "name": "benchmarking step one",
            "status": "FAILED",
            "time_taken": 4,
            "payload": {
                "request": null,
                "response": {
                    "errors": {
                        "code": 400,
                        "message": "Get \"http://api-server:8083/api/step1\": net/http: invalid header field name \" rv\""
                    }
                }
            }
        }
    ],
    "reason": ""
}

Desktop (please complete the following information):

• OS: OSX
• Versions of integrations and other tools used - HTTP API
• Version of Clamp-Core 98a705150969879fa9d22c7f404cb195be59d02a

Additional context
None