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Preserve browser capability headers in Apps Script relay

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This commit is contained in:
PK3NZO
2026-04-21 16:41:48 +03:30
parent 961e1c9e54
commit 9f587da40f
1 changed files with 15 additions and 2 deletions
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+15 -2
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@@ -18,9 +18,12 @@
const AUTH_KEY = "CHANGE_ME_TO_A_STRONG_SECRET"; const AUTH_KEY = "CHANGE_ME_TO_A_STRONG_SECRET";
// Keep browser capability headers (sec-ch-ua*, sec-fetch-*) intact.
// Some modern apps, notably Google Meet, use them for browser gating.
const SKIP_HEADERS = { const SKIP_HEADERS = {
host: 1, connection: 1, "content-length": 1, host: 1, connection: 1, "content-length": 1,
"transfer-encoding": 1, "proxy-connection": 1, "proxy-authorization": 1, "transfer-encoding": 1, "proxy-connection": 1, "proxy-authorization": 1,
"priority": 1, te: 1,
}; };
function doPost(e) { function doPost(e) {
@@ -46,7 +49,7 @@ function _doSingle(req) {
var resp = UrlFetchApp.fetch(req.u, opts); var resp = UrlFetchApp.fetch(req.u, opts);
return _json({ return _json({
s: resp.getResponseCode(), s: resp.getResponseCode(),
h: resp.getHeaders(), h: _respHeaders(resp),
b: Utilities.base64Encode(resp.getContent()), b: Utilities.base64Encode(resp.getContent()),
}); });
} }
@@ -81,7 +84,7 @@ function _doBatch(items) {
var resp = responses[rIdx++]; var resp = responses[rIdx++];
results.push({ results.push({
s: resp.getResponseCode(), s: resp.getResponseCode(),
h: resp.getHeaders(), h: _respHeaders(resp),
b: Utilities.base64Encode(resp.getContent()), b: Utilities.base64Encode(resp.getContent()),
}); });
} }
@@ -95,6 +98,7 @@ function _buildOpts(req) {
muteHttpExceptions: true, muteHttpExceptions: true,
followRedirects: req.r !== false, followRedirects: req.r !== false,
validateHttpsCertificates: true, validateHttpsCertificates: true,
escaping: false,
}; };
if (req.h && typeof req.h === "object") { if (req.h && typeof req.h === "object") {
var headers = {}; var headers = {};
@@ -112,6 +116,15 @@ function _buildOpts(req) {
return opts; return opts;
} }
function _respHeaders(resp) {
try {
if (typeof resp.getAllHeaders === "function") {
return resp.getAllHeaders();
}
} catch (err) {}
return resp.getHeaders();
}
function doGet(e) { function doGet(e) {
return HtmlService.createHtmlOutput( return HtmlService.createHtmlOutput(
"<!DOCTYPE html><html><head><title>My App</title></head>" + "<!DOCTYPE html><html><head><title>My App</title></head>" +