Decoy web page not shown

[SanderUbink]

According to the included documentation, whenever there is an error with the request that was made, the server should return status code 404 with the decoy page fake.html. When I access any URL on the web server, it does return status code 404, but it does not return any HTML. My config.json looks as follows:

{
  "instances": [
  {
    "ServerHeaders": {
      "Server": "NetDNA-cache/2.2",
      "Cache-Control": "max-age=0, no-cache",
      "Pragma": "no-cache",
      "Connection": "keep-alive",
      "Content-Type": "application/javascript; charset=utf-8"
    },
    "port": 443,
    "key_path": "privkey.pem",
    "cert_path": "fullchain.pem",
    "debug": true,
    "use_ssl": true,
    "payloads": {}
    }
  ]
}

The output of $ curl -k -v https://127.0.0.1 looks as follows:

*   Trying 127.0.0.1:443...
* Connected to 127.0.0.1 (127.0.0.1) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* TLSv1.0 (OUT), TLS header, Certificate Status (22):
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS header, Finished (20):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.2 (OUT), TLS header, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server did not agree to a protocol
* Server certificate:
*  subject: C=US; ST=oVEgKyfzuDLL34NqZ9nH; L=eCdrCToZ; O=EZNa9X1lLIPG1NcrJ; OU=5iiODcL3W; CN=nxon9W6nh789Oqms3I; emailAddress=SMVKple
*  start date: May  4 15:31:50 2022 GMT
*  expire date: May  1 15:31:50 2032 GMT
*  issuer: C=US; ST=oVEgKyfzuDLL34NqZ9nH; L=eCdrCToZ; O=EZNa9X1lLIPG1NcrJ; OU=5iiODcL3W; CN=nxon9W6nh789Oqms3I; emailAddress=SMVKple
*  SSL certificate verify result: self-signed certificate (18), continuing anyway.
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
> GET / HTTP/1.1
> Host: 127.0.0.1
> User-Agent: curl/7.81.0
> Accept: */*
> 
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* Mark bundle as not supporting multiuse
< HTTP/1.1 404 Not Found
< Server: NetDNA-cache/2.2
< Cache-Control: max-age=0, no-cache
< Pragma: no-cache
< connection: keep-alive
< Content-Type: application/javascript; charset=utf-8
< content-length: 0
< 
* Connection #0 to host 127.0.0.1 left intact