If’ve found a new error message in our log-files and would like to know, for what this .well_known-folder stands for.

Which application-client would need to access such a folder and which application would create files inside it?

Here are some entries of the PHP Error log of one of my domain. (I removed date, ip and target-domains).

0000/00/00 00:00:00 [error] 851#0: *88611 access forbidden by rule, client: xxx.xxx.xxx.xxx, server: example.com, request: "GET /.well-known/apple-app-site-association HTTP/1.1", host: "exampleA.com"
0000/00/00 00:00:00 [error] 850#0: *89749 access forbidden by rule, client: xxx.xxx.xxx.xxx, server: example.com, request: "GET /.well-known/assetlinks.json HTTP/1.1", host: "exampleA.com"
0000/00/00 00:00:00 [error] 850#0: *89767 access forbidden by rule, client: xxx.xxx.xxx.xxx, server: example.com, request: "GET /.well-known/assetlinks.json HTTP/1.1", host: "exampleB.com"
0000/00/00 00:00:00 [error] 853#0: *90120 access forbidden by rule, client: xxx.xxx.xxx.xxx, server: example.com, request: "GET /.well-known/apple-app-site-association HTTP/1.1", host: "exampleB.com"
0000/00/00 00:00:00 [error] 853#0: *90622 access forbidden by rule, client: xxx.xxx.xxx.xxx, server: example.com, request: "GET /.well-known/apple-app-site-association HTTP/1.1", host: "www.exampleB.com"
0000/00/00 00:00:00 [error] 853#0: *90926 access forbidden by rule, client: xxx.xxx.xxx.xxx, server: example.com, request: "GET /.well-known/assetlinks.json HTTP/1.1", host: "www.exampleA.com"
0000/00/00 00:00:00 [error] 854#0: *91780 access forbidden by rule, client: xxx.xxx.xxx.xxx, server: example.com, request: "GET /.well-known/apple-app-site-association HTTP/1.1", host: "exampleA.com"

First I thought that I could be the one who generated this, but at the times I wasn’t accessing/working these domains. And these access requests comes from 3 of our domains. (with different web-applications)


INFO1: It seems the IP is from the Google-Bot (Crawler) But what are
so important to access these files? (we don’t have these files in the folders, checked for hidden in all domain-root-directorys.)

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