Propagate runtime ID across API requests

Debug chained API requests by propagating a runtime ID

You are given a sequence of 5 API requests that must be executed in order.

• Request 1 (a POST ) succeeds and returns 200 OK with a JSON response containing a newly created resource ID.
• Requests 2–5 currently fail because they incorrectly use a hardcoded ID (e.g., "123" ) in their URL path and/or JSON body instead of the ID returned by Request 1.

Task

Write a function that, given:

1. requests : a list of request objects in execution order. Each request has:
   • method (string)
   • url (string)
   • headers (map of string → string)
   • body (either null , a JSON object, or a JSON string)
2. first_response_body : the parsed JSON body returned by Request 1, which includes the runtime ID (for example under id )
3. old_id : the hardcoded ID value currently present in later requests

returns a new list of requests where, for Requests 2–5:

• Every occurrence of old_id in the request URL is replaced with the runtime ID from first_response_body .
• Every occurrence of old_id anywhere inside the request body (including nested fields, arrays, and string values) is replaced with the runtime ID.

Requirements / Notes

• Do not modify Request 1.
• The runtime ID may be numeric or string; preserve the correct type when updating JSON bodies.
• The request body may be null , a JSON object, or a JSON string (in which case you should parse it, modify it, then serialize it back).
• Assume all requests are well-formed; focus on correct propagation and replacement.

Output

Return the updated list of request objects.