Error 504 on static site generation (WP2Static)

Hey there.
# The static site generation used to work fine but i am not able to run it from a few hours.
## I get this error:
```
504 error code returned from server.
Please check your server's error logs or try increasing your
max_execution_time limit in PHP if this consistently fails
after the same duration.
More information of the error may be logged in your browsers console.
```
## And this is what I get in the console:
```
load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.7.1:5 JQMIGRATE: Migrate is installed, version 3.3.2
load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.7.1:2 POST https://customer-care-solution.com/wp-admin/admin-ajax.php?_fs_blog_admin=true 500
send @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.7.1:2
ajax @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.7.1:2
s.ajax.s.ajax @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.7.1:5
(anonymous) @ admin.php?page=wp2static:566
dispatch @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.7.1:2
v.handle @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.7.1:2
admin.php?page=wp2static:547
admin.php?page=wp2static:548

There has been a critical error on this website.

Learn more about troubleshooting WordPress.

```

## Tried wp-cil
```
$ wp wp2static full_workflow
[2021-05-01T14:34:53+05:30] Starting to detect WordPress site URLs.
[2021-05-01T14:34:55+05:30] Detection complete. 4435 URLs added to Crawl Queue.
[2021-05-01T14:34:55+05:30] Starting crawling
[2021-05-01T14:34:55+05:30] Starting to crawl detected URLs.
[2021-05-01T14:34:55+05:30] Using CrawlCache.
[2021-05-01T14:35:00+05:30] 404 for URL /blog/page/1/
[2021-05-01T14:35:00+05:30] 404 for URL /blog/page/2/
[2021-05-01T14:35:03+05:30] 404 for URL /favicon.ico
[2021-05-01T14:35:08+05:30] 404 for URL /sitemap.xml
[2021-05-01T14:35:59+05:30] Crawling progress: 300 crawled, 3887 skipped (cached).
PHP Fatal error: Uncaught WP2StaticGuzzleHttp\Exception\ConnectException: cURL error 6: Could not resolve host: customer-care-solution.comhttp (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://customer-care-solution.comhttp/customer-care-solution.com/wp-content/plugins/all-in-one-wp-migration/lib/view/assets/css/backups.min.css in /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php:210
Stack trace:
#0 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php(158): WP2StaticGuzzleHttp\Handler\CurlFactory::createRejection()
leonstafford/lokl#1 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php(110): WP2StaticGuzzleHttp\Handler\CurlFactory::finishError()
leonstafford/lokl#2 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlHandler.php(47): WP2StaticGuzzleHttp\Handler\CurlFactory::finish()
leonstafford/lokl#3 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2stati in /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php on line 210
Fatal error: Uncaught WP2StaticGuzzleHttp\Exception\ConnectException: cURL error 6: Could not resolve host: customer-care-solution.comhttp (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://customer-care-solution.comhttp/customer-care-solution.com/wp-content/plugins/all-in-one-wp-migration/lib/view/assets/css/backups.min.css in /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php:210
Stack trace:
#0 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php(158): WP2StaticGuzzleHttp\Handler\CurlFactory::createRejection()
leonstafford/lokl#1 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php(110): WP2StaticGuzzleHttp\Handler\CurlFactory::finishError()
leonstafford/lokl#2 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlHandler.php(47): WP2StaticGuzzleHttp\Handler\CurlFactory::finish()
leonstafford/lokl#3 /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2stati in /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php on line 210
Error: There has been a critical error on this website.Learn more about troubleshooting WordPress. There has been a critical error on this website.
```

In the line `PHP Fatal error: Uncaught WP2StaticGuzzleHttp\Exception\ConnectException: cURL error 6: Could not resolve host: customer-care-solution.comhttp (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://customer-care-solution.comhttp/customer-care-solution.com/wp-content/plugins/all-in-one-wp-migration/lib/view/assets/css/backups.min.css in /usr/html/wp-content/plugins/wp2static/vendor/leonstafford/wp2staticguzzle/src/Handler/CurlFactory.php:210
Stack trace:`

### Why is `http` being appended to `customer-care-solution.com`? And how do I solve this?

# My setup:
1. Lokl site with a reverse proxy running on https.
2. Static site accessible on `customer-care-solution.com`.
3. Modified host files on my computer to point to dynamic WordPress site.