About page: the webmaster may have thanked the language community in a "FAQ" or "About" page.
Open source: the website may have been open-sourced and is available somewhere on Internet.
#How to search a web page for a phrase in firefox code#
Exploits: reading a backup file, or executing arbitrary code on the server.
Default filenames: Check if / and /index.php are the same page.
For example, most sites resize users' avatars, and checking for EXIF data will leak CREATOR: gd-jpeg v1.0 (using IJG JPEG v90), default quality, which may help to guess which language is used.
File uploads: libraries may add metadata if the file is being modified server-side.
Errors: triggering errors may also leak the language.
Specific input: for example, PHP had some easter eggs.
It may be useful if the webmaster kept the default values.
Language limits: maximum post data, maximum number variable in GET and POST data, etc.
HTTP Parameter Pollution: if you managed to guess which server is running, you can refine the guess.
HTTP headers: they may leak some information about the language which is running on the server, and some additional details like the version: X-Powered-By: PHP/7.0.0 means that the page was rendered by PHP.
File extensions: login.php is most likely a PHP script.
There's no way to be 100% sure if you don't have access to the server, so it's about guessing.
_i-made-a-firefox-addon-to-get-meaning-of-words-and-phrases-and-search-the-web-by-selecting-text-on-a-page-preview.jpg "how to search a web page for a phrase in firefox")
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