fix: set path prefix for http ext auth service

[zhaohuabing]

fix: can't configure pathPrefix for extAuth.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.62%. Comparing base (b98893a) to head (2fe5efb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3018      +/-   ##
==========================================
- Coverage   64.63%   64.62%   -0.02%     
==========================================
  Files         121      121              
  Lines       21131    21135       +4     
==========================================
  Hits        13658    13658              
- Misses       6624     6627       +3     
- Partials      849      850       +1     

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[arkodg]

can we also add this into e2e ?

[zhaohuabing]

can we also add this into e2e ?

The mock HTTP ext auth service for e2e doesn't care about path :-(

gateway/test/e2e/testdata/ext-auth-http-service.yaml

Lines 18 to 32 in 2882b7c

	const server = new Http.Server((req, res) => {
	const authorization = req.headers["authorization"] || "";
	const extracted = authorization.split(" ");
	if (extracted.length === 2 && extracted[0] === "Bearer") {
	const user = checkToken(extracted[1]);
	console.log(`token: "${extracted[1]}" user: "${user}`);
	if (user !== undefined) {
	// The authorization server returns a response with "x-current-user" header for a successful
	// request.
	res.writeHead(200, { "x-current-user": user });
	return res.end();
	}
	}
	res.writeHead(403);
	res.end();