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--- networking:proxy:pac_file [2021/01/13 15:49] – peter
+++ networking:proxy:pac_file [2021/01/13 15:53] (current) – peter
@@ Line 3: / Line 3: @@
 [[Networking:Proxy:PAC File:About PAC Files|About PAC Files]]
-[[Networking:Proxy:PAC File:About PAC Files|About PAC Files]]
+[[Networking:Proxy:PAC File:Instruct the web browser to forward all requests addressed to localhost into a blackhole|Instruct the web browser to forward all requests addressed to localhost into a blackhole]]
-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.
-      * In Chrome (versions 52 to 73), you can disable this by setting **PacHttpsUrlStrippingEnabled** to false in policy or by launching with the **<nowiki>--unsafe-pac-url</nowiki>** command-line flag.
-      * In Chrome 74, only the flag works.
-      * In Chrome, from version 75, onwards, there is no way to disable path-stripping.
-      * In Chrome version 81, path-stripping does not apply to HTTP URLs, but there is interest in changing this behavior to match HTTPS;
-      * In Firefox, the preference is **network.proxy.autoconfig_url.include_path**.
-  * **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>