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--- networking:proxy:pac_file:about_pac_files [2021/01/13 15:49] – created peter
+++ networking:proxy:pac_file:about_pac_files [2021/01/13 15:52] (current) – peter
@@ Line 1: / Line 1: @@
 ====== Networking - Proxy - PAC File - About PAC Files ======
+A **PAC** [[https://en.wikipedia.org/wiki/Proxy_auto-config|(Proxy Auto-Configuration)]] file is a JavaScript function that determines whether web browser requests (HTTP, HTTPS, and FTP) go directly to the destination or are forwarded to a web proxy server.
+The JavaScript function contained in the PAC file defines the function:
+<code javascript>
+function FindProxyForURL(url, host) {
+  // ...
+}
+</code>
+<WRAP info>
+**NOTE:**  Parameters:
+  * **url**:  The URL being accessed.
+    * The path and query components of **<nowiki>https://</nowiki>** URLs are stripped.
+      * Different browsers may offer options to override or disable this.
+  * **host**:  The hostname extracted from the URL.
+    * This is only for convenience; it is the same string as between **<nowiki>://</nowiki>** and the first **<nowiki>:</nowiki>** or **<nowiki>/</nowiki>** after that.
+    * The port number is not included in this parameter; It can be extracted from the URL when necessary.
+</WRAP>
+----
+===== References =====
+https://developer.mozilla.org/en-US/docs/Web/HTTP/Proxy_servers_and_tunneling/Proxy_Auto-Configuration_PAC_file