Empty HTTP 200 OK response results in "URL doesn't seem to be a webpage. Skipping."

[BreakfastSerial]

I am working with a web application, that offers a resource download endpoint (e.g. https://example.com/download?id=1), if the id is omitted, it responds with an empty HTTP 200 OK, which is expected.

I want to use Arjun to help me find alternative parameters, but It refuses to work with empty HTTP 200 OK responses.

Using Arjun v2.2.7, installed via pip on Kali.

[s0md3v]

Can you post the response headers here? It is likely that the content-type is messed up.

[BreakfastSerial]

Sorry about the late reply, I'll have to dig out the project again, but I'll provide the response in a bit. Thank you for your work! Edit: I found the request/response in question:

If the parameter id=1 is missing, the servers response looks like:

HTTP/2 200 OK
Cache-Control: no-cache, no-store, must-revalidate,no-cache, no-store
Pragma: no-cache,no-cache
Expires: 0,-1
Access-Control-Allow-Headers: Origin, Content-Type, X-Auth-Token
Strict-Transport-Security: max-age=31536000
X-Frame-Options: DENY
X-Xss-Protection: 1;
Content-Security-Policy: frame-ancestors 'self'
X-Content-Type-Options: nosniff
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: accelerometer=(), camera=(); geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()
Date: <DATE>
Content-Length: 0

While the response including the required parameter id=1 is:

HTTP/2 200 OK
Cache-Control: no-cache, no-store, must-revalidate,no-cache, no-store
Pragma: no-cache,no-cache
Content-Type: application/pdf
Expires: 0,-1
Access-Control-Allow-Headers: Origin, Content-Type, X-Auth-Token
Strict-Transport-Security: max-age=31536000
X-Frame-Options: DENY
X-Xss-Protection: 1;
Content-Security-Policy: frame-ancestors 'self'
X-Content-Type-Options: nosniff
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: accelerometer=(), camera=(); geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()
Date: <DATE>
Content-Length: <LENGTH>

%PDF-1.5[...]