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Every web server has an inner ordering of the header.
We consider the following answers as an example: Response from Apache 1.3.23 $ nc apache.80 HEAD / HTTP/1.0 HTTP/1.1 200 OK Date: Sun, : 49 GMT Server: Apache/1.3.23 Last-Modified: Thu, : 19 GMT ETag: 32417-c4-3e5d8a83 Accept-Ranges: bytes Content-Length: 196 Connection: close Content-Type: text/HTML $ nc iis.80 HEAD / HTTP/1.0 HTTP/1.1 200 OK Server: Microsoft-IIS/5.0 Content-Location: Fri, : 52 GMT Content-Type: text/HTML Accept-Ranges: bytes Last-Modified: Fri, : 52 GMT ETag: W/e0d362a4c335be1: ae1 Content-Length: 133 $ nc netscape.80 HEAD / HTTP/1.0 HTTP/1.1 200 OK Server: Netscape-Enterprise/4.1 Date: Mon, : 40 GMT Content-type: text/HTML Last-modified: Wed, : 56 GMT Content-length: 57 Accept-ranges: bytes Connection: close $ nc sunone.80 HEAD / HTTP/1.0 HTTP/1.1 200 OK Server: Sun-ONE-Web-Server/6.1 Date: Tue, GMT Content-length: 0 Content-type: text/html Date: Tue, GMT Last-Modified: Wed, GMT Connection: close We can notice that the ordering of the Date field and the Server field differs between Apache, Netscape Enterprise, and IIS.
If you get some time, c URL out to different popular domains and see what headers they send -- you could be surprised!
Servlets are Java technology's answer to Common Gateway Interface (CGI) programming.
The tests to carry out in order to accurately fingerprint a web server can be many.
Luckily, there are tools that automate these tests. httprint has a signature dictionary that allows one to recognize the type and the version of the web server in use.
Knowing the type of web server that you are testing significantly helps in the testing process, and will also change the course of the test.
We can retrieve remote content with curl, post to a remote URL, and perform hundreds of other tasks.
Knowing the version and type of a running web server allows testers to determine known vulnerabilities and the appropriate exploits to use during testing.