Interesting. I entered a URL into Signal in 'note to self' (didn't send) and in my access log I saw 162.210.7.8 - - [20/Jul/2022:16:40:18 -0500] "GET / HTT

Interesting. I entered a URL into Signal in 'note to self' (didn't send) and in my access log I saw 162.210.7.8 - - [20/Jul/2022:16:40:18 -0500] "GET / HTTP/1.1" 200 15336 "-" "WhatsApp/2" of course, anyone can send any user agent they like. Maybe signal is doing this for better compatibility. I did a quick search in the open source of signal-android and found this: https://github.com/signalapp/Signal-Android/blob/e22ddb8f96f8801f0abe622b5261abc6cb396d94/app/src/main/java/org/thoughtcrime/securesms/linkpreview/LinkPreviewRepository.java#L82 https://github.com/signalapp/Signal-Android/blob/e22ddb8f96f... public LinkPreviewRepository() { this.client = new OkHttpClient.Builder() .cache(null) .addInterceptor(new UserAgentInterceptor("WhatsApp/2")) .build(); } so yes the client app generates a preview of an entered URL by making requests with the user agent WhatsApp/2.