Fix for localhost vs IP cypress testing issue (#12)

Well this was an odd one... The React frontend could interact with the
Python backend using localhost when the Analyze button was click.
Cypress performing the same button click did not trigger a call to the
Python API. My initial fix was changing the url invoked by the button
click to `127.0.0.1` instead of `localhost`, but the IP didn't sit right
with me. I tried several other fixes, but [enabling
`ipv4first`](cypress-io/cypress#25397 (comment))
is the only one that worked. This is due to a fairly recent change to
NodeJS documented
[here](https://nodejs.org/api/dns.html#dnssetdefaultresultorderorder)
and further explained
[here](https://nodejs.org/api/dns.html#dnslookuphostname-options-callback)
as setting `verbatim` to false in dns lookup, which prioritized ipv4
addresses over ipv6:

> verbatim
[<boolean>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type)
When true, the callback receives IPv4 and IPv6 addresses in the order
the DNS resolver returned them. When false, IPv4 addresses are placed
before IPv6 addresses. Default: true (addresses are not reordered).

python-backend/main.py

@@ -11,7 +11,7 @@
 
 import constants
 import logger
-import math_utils
+from graph_utils import error_coordinates, delta_coordinates
 from input import Input, convert
 from wolfram_client import WolframClient
 
@@ -57,8 +57,8 @@ async def analyze(request: Request):
             "wolfram_limit": WolframClient.limit(str(simple)),
             "limit": json.dumps(float(limit)),
             "denominator_limit": json.dumps(float(q_limit)),
-            "log_error": json.dumps(math_utils.error_coordinates(simple, x, limit)),
-            "delta": json.dumps(math_utils.delta_coordinates(simple, simple_q, x, limit)),
+            "log_error": json.dumps(error_coordinates(simple, x, limit)),
+            "delta": json.dumps(delta_coordinates(simple, simple_q, x, limit)),
             "computed_value": json.dumps(float(limit))  # @TODO: replace with actual computation to i
         }
 

react-frontend/src/components/Form.tsx

@@ -58,7 +58,7 @@ function Form() {
 		};
 		console.log(body);
 		axios
-			.post('http://127.0.0.1:8000/analyze', body)
+			.post('http://localhost:8000/analyze', body)
 			.then((response) => {
 				if (response.status == 200) {
 					setResults(response.data);

react-frontend/vite.config.js

@@ -1,6 +1,9 @@
 import { defineConfig } from 'vite';
 import eslint from 'vite-plugin-eslint';
 import react from '@vitejs/plugin-react';
+// for the following see https://github.com/cypress-io/cypress/issues/25397#issuecomment-1775454875
+import dns from 'dns'
+dns.setDefaultResultOrder('ipv4first')
 
 export default defineConfig(() => {
 	return {