Do you support pac(proxy automatic configuration)?

shun-miyoshi-com · October 2, 2017, 7:14am

I want to pac(proxy automatic configuration) file for proxy environment in net/http package.
But I don’t know how to configure by pac file.
I wish to use like “ProxyFromEnvironment” method in http package.

nathankerr · October 2, 2017, 7:41am

This package should get you started:

And an example of how to build an http.Transport that uses it:

github.com

jackwakefield/transpac/blob/master/proxy.go#L30


	"net/url"
	"strings"


	"github.com/jackwakefield/gopac"
)


var errorProxyRetrieval = errors.New("unable to retrieve proxy")


func newProxyClient(parser *gopac.Parser) *http.Client {
	return &http.Client{Transport: &http.Transport{
		Proxy: func(req *http.Request) (*url.URL, error) {
			// retrieve the proxy entry for the requested URL and host
			entry, err := parser.FindProxy(req.URL.String(), req.URL.Host)


			if err == nil {
				// strip the PROXY prefix, the server delimiter, and then split
				// the entry to retrieve an array of proxy servers to be used for
				// the request
				entry = strings.Replace(entry, "PROXY ", "", -1)
				entry = strings.Replace(entry, "; ", "", -1)
				hosts := strings.Split(entry, " ")

shun-miyoshi-com · October 3, 2017, 11:32am

I wish official support of golang.
I think your suggestion is not given official support.(misunderstanding?)

nathankerr · October 3, 2017, 12:35pm

There is no “official support” for pac, and it is is extremely unlikely that there will be.

The problem is that a pac file is defined as containing a JavaScript function. That means anything supporting pac requires a complete JavaScript interpreter.

Since pac is not directly supported by the standard library, I responded with the best resources I could find.

shun-miyoshi-com · October 5, 2017, 12:02am

I understand.
Thanks for your reply.

system · January 3, 2018, 12:02am

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