• Attach extra headers for all requests
• Interpolate header names and header values using Python functions
• Define your own Python functions and use them in interpolations
• Set active environment in a file
• All unused command arguments in this script are passed to hurl.

1. Create directory envs in the project folder, and put variables in envs/<environment>.env. The format of the file is identical to hurl's --variables-file.
   • Example: local environmental variables should be saved in envs/local.env.
   • Example: dev environmental variables should be saved in envs/dev.dev.
2. Create file .helper/env, and in the file, indicate the name of the active environment.
   • Example: if .helper/env's content is local, all variables defined in env/local.env will be used in the HTTP request.

1. Create file .helper/extra-functions.py in the project folder.
2. Define your Python functions. You are free to import any built-in packages.

Example: Define a function to create a random UUID

import uuid
def random_uuid():
    return str(uuid.uuid4())

1. Create file .helper/default-headers.json in the project folder.
2. Define an object in the json file where:
   1. key-value pairs defined in base object are the headers for all environments.
   2. key-value pairs could be defined in a nested object, which means they are for a specific environments.
3. You can use %%python{<function call>}%% to call the functions defined in .helper/extra-functions.py.

Example: Define default headers

{
  "Header1": "Value1",
  "Header2": "Value2",
  "local": {
    "Header1": "LocalValue1",
    "Header3": "LocalValue3"
  },
  "dev": {
    "Header2": "DevHeader2",
    "UUID": "%%python{random_uuid()}"
  }
}

In this example, if local environment is being used, headers will be sent as:

Header1: LocalValue1
Header2: Value2
Header3: LocalValue3

if dev environment is being used, headers will be sent as:

Header1: Value1
Header2: DevHeader2
UUID: <Result of function call random_uuid()>

For each request, the function is called separately.