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Looks like the page you requested doesn't exist.
postgres=# SELECT page FROM website WHERE url = '/docs/pgadmin4/4.27/code_snippets.html'; page ------ (0 rows)
Here are pages with the same name from other versions of the documentation that are available:
postgres=# SELECT version, title FROM docs WHERE page = 'code_snippets.html'; version | title -------------+---------------------------------------------- 8.4 | Code Snippets — pgAdmin 4 8.4 documentation 8.3 | Code Snippets — pgAdmin 4 8.3 documentation 7.8 | Code Snippets — pgAdmin 4 7.8 documentation 6.21 | Code Snippets — pgAdmin 4 6.21 documentation Development | Code Snippets — pgAdmin 4 8.4 documentation (5 rows)