If anyone is interested in how to get the PDF URL for a search results page, follow the steps below.
Firefox (desktop):
1. Perform a search
2. Open the web browser developer tools, using any of the following:
- F12
- CTRL+SHIFT+I
- Menu > More Tools > Web Developer Tools
3. In the developer tools, select the Network tab
4. Refresh the search results page
5. View developer tools Network panel to see a list of HTTP requests the page made
6. Click the entry that has "PDF" in the Type column (it'll probably be the last entry in the list)
7. The right hand panel will show the details of the request, including the full URL to PDF
Edge & Chrome (desktop):
1. Perform a search
2. Open the web browser developer tools, using any of the following:
- F12
- CTRL+SHIFT+I
- Menu > More Tools > Developer Tools
3. In the developer tools, select the Network tab
4. Refresh the search results page
5. View developer tools Network panel to see a list of HTTP requests the page made
6. Click the entry that has "pdf.js" in the Initiator column (it'll probably be the last entry in the list)
7. The right hand panel will show the details of the request, including the full URL to PDF
Attached are Firefox screenshots of the Dev Tools Network panel. Edge and Chrome are similar.
The Firefox, Edge and Chrome tools also have a handy helper, in that you can double click the File/Name in the Network list and the browser will open the URL (ie the PDF) in a new tab.
If you leave the Dev Tools open, each time you navigate through pages, or perform a search, the Network list will be updated with any new requests. If you end up with a lot of entries in the list you can clear them by clicking the Clear button (the dustbin icon in Firefox and the "no entry" (?) icon in Edge & Chrome).