Repository: authts/oidc-client-ts
Pull request #1818 (2025-01-22 21:31:36)

Add url_state to SignoutRequest
Extends the fix added for #293 in PR https://github.com/authts/oidc-client-ts/pull/1212 to also cover sign out.

For background I believe the same principles regarding `state` for sign in within the linked issue also apply in the sign out case as well. I am working with a multi-tenant system that has a proxy to resolve the actual hostname for the redirect_uri, which also needs to send a signed-out user back to the application start page on the right hostname.

Without this fix, I would need to configure every potential hostname as a valid redirect URI in the IDP client config (whilst I think Keycloak can allow wildcards, it's not recommended and others such as Entra ID do not).

This change replicates the concatenated internal opaque state value with a custom `url_state` value and delimiter as used in sign in. Tests have been added to ensure the `url_state` can still be added even if the sign out request does not need to persist any client state.

Apologies for not raising an issue first, in tweaking the code to see if it was viable I basically had the PR already written.

### Checklist

- [x] This PR makes changes to the public API <!-- was the API report (docs/oidc-client-ts.api.md) updated by this PR? -->
- [ ] I have included links for closing relevant issue numbers



Patch:
diff --git a/docs/oidc-client-ts.api.md b/docs/oidc-client-ts.api.md
index 614d587e..d247e2a2 100644
--- a/docs/oidc-client-ts.api.md
+++ b/docs/oidc-client-ts.api.md
@@ -108,7 +108,7 @@ export type ExtraHeader = string | (() => string);
 export type ExtraSigninRequestArgs = Pick<CreateSigninRequestArgs, "nonce" | "extraQueryParams" | "extraTokenParams" | "state" | "redirect_uri" | "prompt" | "acr_values" | "login_hint" | "scope" | "max_age" | "ui_locales" | "resource" | "url_state">;
 
 // @public (undocumented)
-export type ExtraSignoutRequestArgs = Pick<CreateSignoutRequestArgs, "extraQueryParams" | "state" | "id_token_hint" | "post_logout_redirect_uri">;
+export type ExtraSignoutRequestArgs = Pick<CreateSignoutRequestArgs, "extraQueryParams" | "state" | "id_token_hint" | "post_logout_redirect_uri" | "url_state">;
 
 // Warning: (ae-forgotten-export) The symbol "Mandatory" needs to be exported by the entry point index.d.ts
 //
@@ -336,7 +336,7 @@ export class OidcClient {
     // (undocumented)
     createSigninRequest({ state, request, request_uri, request_type, id_token_hint, login_hint, skipUserInfo, nonce, url_state, response_type, scope, redirect_uri, prompt, display, max_age, ui_locales, acr_values, resource, response_mode, extraQueryParams, extraTokenParams, dpopJkt, omitScopeWhenRequesting, }: CreateSigninRequestArgs): Promise<SigninRequest>;
     // (undocumented)
-    createSignoutRequest({ state, id_token_hint, client_id, request_type, post_logout_redirect_uri, extraQueryParams, }?: CreateSignoutRequestArgs): Promise<SignoutRequest>;
+    createSignoutRequest({ state, id_token_hint, client_id, request_type, url_state, post_logout_redirect_uri, extraQueryParams, }?: CreateSignoutRequestArgs): Promise<SignoutRequest>;
     // (undocumented)
     getDpopProof(dpopStore: DPoPStore, nonce?: string): Promise<string>;
     // (undocumented)
@@ -855,7 +855,7 @@ export type SignoutRedirectArgs = RedirectParams & ExtraSignoutRequestArgs;
 
 // @public (undocumented)
 export class SignoutRequest {
-    constructor({ url, state_data, id_token_hint, post_logout_redirect_uri, extraQueryParams, request_type, client_id, }: SignoutRequestArgs);
+    constructor({ url, state_data, id_token_hint, post_logout_redirect_uri, extraQueryParams, request_type, client_id, url_state, }: SignoutRequestArgs);
     // (undocumented)
     readonly state?: State;
     // (undocumented)
@@ -877,6 +877,8 @@ export interface SignoutRequestArgs {
     state_data?: unknown;
     // (undocumented)
     url: string;
+    // (undocumented)
+    url_state?: string;
 }
 
 // @public (undocumented)
@@ -890,6 +892,8 @@ export class SignoutResponse {
     error_uri: string | null;
     // (undocumented)
     readonly state: string | null;
+    // (undocumented)
+    url_state?: string;
     userState: unknown;
 }
 
diff --git a/package-lock.json b/package-lock.json
index ceb12114..29cc63f8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,11 +21,11 @@
         "@types/node": "^22.10.1",
         "@typescript-eslint/eslint-plugin": "^8.20.0",
         "@typescript-eslint/parser": "^8.20.0",
-        "esbuild": "^0.24.0",
+        "esbuild": "^0.25.0",
         "eslint": "^9.18.0",
         "eslint-plugin-testing-library": "^7.1.1",
         "fake-indexeddb": "^6.0.0",
-        "globals": "^15.14.0",
+        "globals": "^16.0.0",
         "http-proxy-middleware": "^3.0.3",
         "husky": "^9.1.7",
         "jest": "^29.7.0",
@@ -517,13 +517,14 @@
       "dev": true
     },
     "node_modules/@esbuild/aix-ppc64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.24.2.tgz",
-      "integrity": "sha512-thpVCb/rhxE/BnMLQ7GReQLLN8q9qbHmI55F4489/ByVg2aQaQ6kbcLb6FHkocZzQhxc4gx0sCk0tJkKBFzDhA==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.0.tgz",
+      "integrity": "sha512-O7vun9Sf8DFjH2UtqK8Ku3LkquL9SZL8OLY1T5NZkA34+wG3OQF7cl4Ql8vdNzM6fzBbYfLaiRLIOZ+2FOCgBQ==",
       "cpu": [
         "ppc64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "aix"
@@ -533,13 +534,14 @@
       }
     },
     "node_modules/@esbuild/android-arm": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.24.2.tgz",
-      "integrity": "sha512-tmwl4hJkCfNHwFB3nBa8z1Uy3ypZpxqxfTQOcHX+xRByyYgunVbZ9MzUUfb0RxaHIMnbHagwAxuTL+tnNM+1/Q==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.25.0.tgz",
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       "cpu": [
         "arm"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "android"
@@ -549,13 +551,14 @@
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     },
     "node_modules/@esbuild/android-arm64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.24.2.tgz",
-      "integrity": "sha512-cNLgeqCqV8WxfcTIOeL4OAtSmL8JjcN6m09XIgro1Wi7cF4t/THaWEa7eL5CMoMBdjoHOTh/vwTO/o2TRXIyzg==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.25.0.tgz",
+      "integrity": "sha512-grvv8WncGjDSyUBjN9yHXNt+cq0snxXbDxy5pJtzMKGmmpPxeAmAhWxXI+01lU5rwZomDgD3kJwulEnhTRUd6g==",
       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "android"
@@ -565,13 +568,14 @@
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     },
     "node_modules/@esbuild/android-x64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.24.2.tgz",
-      "integrity": "sha512-B6Q0YQDqMx9D7rvIcsXfmJfvUYLoP722bgfBlO5cGvNVb5V/+Y7nhBE3mHV9OpxBf4eAS2S68KZztiPaWq4XYw==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.25.0.tgz",
+      "integrity": "sha512-m/ix7SfKG5buCnxasr52+LI78SQ+wgdENi9CqyCXwjVR2X4Jkz+BpC3le3AoBPYTC9NHklwngVXvbJ9/Akhrfg==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "android"
@@ -581,13 +585,14 @@
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     },
     "node_modules/@esbuild/darwin-arm64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.24.2.tgz",
-      "integrity": "sha512-kj3AnYWc+CekmZnS5IPu9D+HWtUI49hbnyqk0FLEJDbzCIQt7hg7ucF1SQAilhtYpIujfaHr6O0UHlzzSPdOeA==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.25.0.tgz",
+      "integrity": "sha512-mVwdUb5SRkPayVadIOI78K7aAnPamoeFR2bT5nszFUZ9P8UpK4ratOdYbZZXYSqPKMHfS1wdHCJk1P1EZpRdvw==",
       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "darwin"
@@ -597,13 +602,14 @@
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     },
     "node_modules/@esbuild/darwin-x64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.24.2.tgz",
-      "integrity": "sha512-WeSrmwwHaPkNR5H3yYfowhZcbriGqooyu3zI/3GGpF8AyUdsrrP0X6KumITGA9WOyiJavnGZUwPGvxvwfWPHIA==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.25.0.tgz",
+      "integrity": "sha512-DgDaYsPWFTS4S3nWpFcMn/33ZZwAAeAFKNHNa1QN0rI4pUjgqf0f7ONmXf6d22tqTY+H9FNdgeaAa+YIFUn2Rg==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "darwin"
@@ -613,13 +619,14 @@
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     "node_modules/@esbuild/freebsd-arm64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.24.2.tgz",
-      "integrity": "sha512-UN8HXjtJ0k/Mj6a9+5u6+2eZ2ERD7Edt1Q9IZiB5UZAIdPnVKDoG7mdTVGhHJIeEml60JteamR3qhsr1r8gXvg==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.25.0.tgz",
+      "integrity": "sha512-VN4ocxy6dxefN1MepBx/iD1dH5K8qNtNe227I0mnTRjry8tj5MRk4zprLEdG8WPyAPb93/e4pSgi1SoHdgOa4w==",
       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "freebsd"
@@ -629,13 +636,14 @@
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     },
     "node_modules/@esbuild/freebsd-x64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.24.2.tgz",
-      "integrity": "sha512-TvW7wE/89PYW+IevEJXZ5sF6gJRDY/14hyIGFXdIucxCsbRmLUcjseQu1SyTko+2idmCw94TgyaEZi9HUSOe3Q==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.25.0.tgz",
+      "integrity": "sha512-mrSgt7lCh07FY+hDD1TxiTyIHyttn6vnjesnPoVDNmDfOmggTLXRv8Id5fNZey1gl/V2dyVK1VXXqVsQIiAk+A==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "freebsd"
@@ -645,13 +653,14 @@
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     },
     "node_modules/@esbuild/linux-arm": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.24.2.tgz",
-      "integrity": "sha512-n0WRM/gWIdU29J57hJyUdIsk0WarGd6To0s+Y+LwvlC55wt+GT/OgkwoXCXvIue1i1sSNWblHEig00GBWiJgfA==",
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.25.0.tgz",
+      "integrity": "sha512-vkB3IYj2IDo3g9xX7HqhPYxVkNQe8qTK55fraQyTzTX/fxaDtXiEnavv9geOsonh2Fd2RMB+i5cbhu2zMNWJwg==",
       "cpu": [
         "arm"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -661,13 +670,14 @@
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     "node_modules/@esbuild/linux-arm64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.24.2.tgz",
-      "integrity": "sha512-7HnAD6074BW43YvvUmE/35Id9/NB7BeX5EoNkK9obndmZBUk8xmJJeU7DwmUeN7tkysslb2eSl6CTrYz6oEMQg==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.25.0.tgz",
+      "integrity": "sha512-9QAQjTWNDM/Vk2bgBl17yWuZxZNQIF0OUUuPZRKoDtqF2k4EtYbpyiG5/Dk7nqeK6kIJWPYldkOcBqjXjrUlmg==",
       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -677,13 +687,14 @@
       }
     },
     "node_modules/@esbuild/linux-ia32": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.24.2.tgz",
-      "integrity": "sha512-sfv0tGPQhcZOgTKO3oBE9xpHuUqguHvSo4jl+wjnKwFpapx+vUDcawbwPNuBIAYdRAvIDBfZVvXprIj3HA+Ugw==",
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.25.0.tgz",
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       "cpu": [
         "ia32"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -693,13 +704,14 @@
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     },
     "node_modules/@esbuild/linux-loong64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.24.2.tgz",
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+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.25.0.tgz",
+      "integrity": "sha512-fC95c/xyNFueMhClxJmeRIj2yrSMdDfmqJnyOY4ZqsALkDrrKJfIg5NTMSzVBr5YW1jf+l7/cndBfP3MSDpoHw==",
       "cpu": [
         "loong64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -709,13 +721,14 @@
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     },
     "node_modules/@esbuild/linux-mips64el": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.24.2.tgz",
-      "integrity": "sha512-iMkk7qr/wl3exJATwkISxI7kTcmHKE+BlymIAbHO8xanq/TjHaaVThFF6ipWzPHryoFsesNQJPE/3wFJw4+huw==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.25.0.tgz",
+      "integrity": "sha512-nkAMFju7KDW73T1DdH7glcyIptm95a7Le8irTQNO/qtkoyypZAnjchQgooFUDQhNAy4iu08N79W4T4pMBwhPwQ==",
       "cpu": [
         "mips64el"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -725,13 +738,14 @@
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     "node_modules/@esbuild/linux-ppc64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.24.2.tgz",
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       "cpu": [
         "ppc64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -741,13 +755,14 @@
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     "node_modules/@esbuild/linux-riscv64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.24.2.tgz",
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.25.0.tgz",
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       "cpu": [
         "riscv64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -757,13 +772,14 @@
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     "node_modules/@esbuild/linux-s390x": {
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-      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.24.2.tgz",
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       "cpu": [
         "s390x"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -773,13 +789,14 @@
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     },
     "node_modules/@esbuild/linux-x64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.24.2.tgz",
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+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.25.0.tgz",
+      "integrity": "sha512-9yl91rHw/cpwMCNytUDxwj2XjFpxML0y9HAOH9pNVQDpQrBxHy01Dx+vaMu0N1CKa/RzBD2hB4u//nfc+Sd3Cw==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "linux"
@@ -789,13 +806,14 @@
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     },
     "node_modules/@esbuild/netbsd-arm64": {
-      "version": "0.24.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.24.2.tgz",
-      "integrity": "sha512-wuLK/VztRRpMt9zyHSazyCVdCXlpHkKm34WUyinD2lzK07FAHTq0KQvZZlXikNWkDGoT6x3TD51jKQ7gMVpopw==",
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+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.25.0.tgz",
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       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
         "netbsd"
@@ -805,13 +823,14 @@
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     "node_modules/@esbuild/netbsd-x64": {
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-        "@esbuild/linux-x64": "0.24.2",
-        "@esbuild/netbsd-arm64": "0.24.2",
-        "@esbuild/netbsd-x64": "0.24.2",
-        "@esbuild/openbsd-arm64": "0.24.2",
-        "@esbuild/openbsd-x64": "0.24.2",
-        "@esbuild/sunos-x64": "0.24.2",
-        "@esbuild/win32-arm64": "0.24.2",
-        "@esbuild/win32-ia32": "0.24.2",
-        "@esbuild/win32-x64": "0.24.2"
+        "@esbuild/aix-ppc64": "0.25.0",
+        "@esbuild/android-arm": "0.25.0",
+        "@esbuild/android-arm64": "0.25.0",
+        "@esbuild/android-x64": "0.25.0",
+        "@esbuild/darwin-arm64": "0.25.0",
+        "@esbuild/darwin-x64": "0.25.0",
+        "@esbuild/freebsd-arm64": "0.25.0",
+        "@esbuild/freebsd-x64": "0.25.0",
+        "@esbuild/linux-arm": "0.25.0",
+        "@esbuild/linux-arm64": "0.25.0",
+        "@esbuild/linux-ia32": "0.25.0",
+        "@esbuild/linux-loong64": "0.25.0",
+        "@esbuild/linux-mips64el": "0.25.0",
+        "@esbuild/linux-ppc64": "0.25.0",
+        "@esbuild/linux-riscv64": "0.25.0",
+        "@esbuild/linux-s390x": "0.25.0",
+        "@esbuild/linux-x64": "0.25.0",
+        "@esbuild/netbsd-arm64": "0.25.0",
+        "@esbuild/netbsd-x64": "0.25.0",
+        "@esbuild/openbsd-arm64": "0.25.0",
+        "@esbuild/openbsd-x64": "0.25.0",
+        "@esbuild/sunos-x64": "0.25.0",
+        "@esbuild/win32-arm64": "0.25.0",
+        "@esbuild/win32-ia32": "0.25.0",
+        "@esbuild/win32-x64": "0.25.0"
       }
     },
     "node_modules/escalade": {
@@ -3230,21 +3307,22 @@
       }
     },
     "node_modules/eslint": {
-      "version": "9.18.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.18.0.tgz",
-      "integrity": "sha512-+waTfRWQlSbpt3KWE+CjrPPYnbq9kfZIYUqapc0uBXyjTp8aYXZDsUH16m39Ryq3NjAVP4tjuF7KaukeqoCoaA==",
+      "version": "9.21.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.21.0.tgz",
+      "integrity": "sha512-KjeihdFqTPhOMXTt7StsDxriV4n66ueuF/jfPNC3j/lduHwr/ijDwJMsF+wyMJethgiKi5wniIE243vi07d3pg==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.12.1",
-        "@eslint/config-array": "^0.19.0",
-        "@eslint/core": "^0.10.0",
-        "@eslint/eslintrc": "^3.2.0",
-        "@eslint/js": "9.18.0",
-        "@eslint/plugin-kit": "^0.2.5",
+        "@eslint/config-array": "^0.19.2",
+        "@eslint/core": "^0.12.0",
+        "@eslint/eslintrc": "^3.3.0",
+        "@eslint/js": "9.21.0",
+        "@eslint/plugin-kit": "^0.2.7",
         "@humanfs/node": "^0.16.6",
         "@humanwhocodes/module-importer": "^1.0.1",
-        "@humanwhocodes/retry": "^0.4.1",
+        "@humanwhocodes/retry": "^0.4.2",
         "@types/estree": "^1.0.6",
         "@types/json-schema": "^7.0.15",
         "ajv": "^6.12.4",
@@ -3640,9 +3718,9 @@
       "dev": true
     },
     "node_modules/fast-uri": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.0.5.tgz",
-      "integrity": "sha512-5JnBCWpFlMo0a3ciDy/JckMzzv1U9coZrIhedq+HXxxUfDTAiS0LA8OKVao4G9BxmCVck/jtA5r3KAtRWEyD8Q==",
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.0.6.tgz",
+      "integrity": "sha512-Atfo14OibSv5wAp4VWNsFYE1AchQRTv9cBGWET4pZWHzYshFSS9NQI6I57rdKn9croWVMbYFbLhJ+yJvmZIIHw==",
       "dev": true,
       "funding": [
         {
@@ -3653,7 +3731,8 @@
           "type": "opencollective",
           "url": "https://opencollective.com/fastify"
         }
-      ]
+      ],
+      "license": "BSD-3-Clause"
     },
     "node_modules/fastq": {
       "version": "1.18.0",
@@ -3794,17 +3873,18 @@
       }
     },
     "node_modules/fs-extra": {
-      "version": "7.0.1",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-7.0.1.tgz",
-      "integrity": "sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==",
+      "version": "11.3.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-11.3.0.tgz",
+      "integrity": "sha512-Z4XaCL6dUDHfP/jT25jJKMmtxvuwbkrD1vNSMFlo9lNLY2c5FHYSQgHPRZUjAB26TpDEoW9HCOgplrdbaPV/ew==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "graceful-fs": "^4.1.2",
-        "jsonfile": "^4.0.0",
-        "universalify": "^0.1.0"
+        "graceful-fs": "^4.2.0",
+        "jsonfile": "^6.0.1",
+        "universalify": "^2.0.0"
       },
       "engines": {
-        "node": ">=6 <7 || >=8"
+        "node": ">=14.14"
       }
     },
     "node_modules/fs.realpath": {
@@ -3914,10 +3994,11 @@
       }
     },
     "node_modules/globals": {
-      "version": "15.14.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-15.14.0.tgz",
-      "integrity": "sha512-OkToC372DtlQeje9/zHIo5CT8lRP/FUgEOKBEhU4e0abL7J7CD24fD9ohiLN5hagG/kWCYj4K5oaxxtj2Z0Dig==",
+      "version": "16.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-16.0.0.tgz",
+      "integrity": "sha512-iInW14XItCXET01CQFqudPOWP2jYMl7T+QRQT+UNcR/iQncN/F0UNpgd76iFkBPgNQb4+X3LV9tLJYzwh+Gl3A==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=18"
       },
@@ -4098,6 +4179,7 @@
       "resolved": "https://registry.npmjs.org/import-lazy/-/import-lazy-4.0.0.tgz",
       "integrity": "sha512-rKtvo6a868b5Hu3heneU+L4yEQ4jYKLtjpnPeUdK7h0yzXGmyBTypknlkCvHFBqfX9YlorEiMM6Dnq/5atfHkw==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=8"
       }
@@ -4927,7 +5009,8 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/jju/-/jju-1.4.0.tgz",
       "integrity": "sha512-8wb9Yw966OSxApiCt0K3yNJL8pnNeIv+OEq2YMidz4FKP6nonSRoOXc80iXY4JaN2FC11B9qsNmDsm+ZOfMROA==",
-      "dev": true
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/jose": {
       "version": "5.9.6",
@@ -5050,10 +5133,14 @@
       }
     },
     "node_modules/jsonfile": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
-      "integrity": "sha512-m6F1R3z8jjlf2imQHS2Qez5sjKWQzbuuhuJ/FKYFRZvPE3PuHcSMVZzfsLhGVOkfd20obL5SWEBew5ShlquNxg==",
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.1.0.tgz",
+      "integrity": "sha512-5dgndWOriYSm5cnYaJNhalLNDKOqFwyDB/rr1E9ZsGciGvKPs8R2xYGCacuf3z6K1YKDz182fd+fY3cn3pMqXQ==",
       "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "universalify": "^2.0.0"
+      },
       "optionalDependencies": {
         "graceful-fs": "^4.1.6"
       }
@@ -5135,21 +5222,22 @@
       }
     },
     "node_modules/lint-staged": {
-      "version": "15.4.1",
-      "resolved": "https://registry.npmjs.org/lint-staged/-/lint-staged-15.4.1.tgz",
-      "integrity": "sha512-P8yJuVRyLrm5KxCtFx+gjI5Bil+wO7wnTl7C3bXhvtTaAFGirzeB24++D0wGoUwxrUKecNiehemgCob9YL39NA==",
-      "dev": true,
-      "dependencies": {
-        "chalk": "~5.4.1",
-        "commander": "~12.1.0",
-        "debug": "~4.4.0",
-        "execa": "~8.0.1",
-        "lilconfig": "~3.1.3",
-        "listr2": "~8.2.5",
-        "micromatch": "~4.0.8",
-        "pidtree": "~0.6.0",
-        "string-argv": "~0.3.2",
-        "yaml": "~2.6.1"
+      "version": "15.4.3",
+      "resolved": "https://registry.npmjs.org/lint-staged/-/lint-staged-15.4.3.tgz",
+      "integrity": "sha512-FoH1vOeouNh1pw+90S+cnuoFwRfUD9ijY2GKy5h7HS3OR7JVir2N2xrsa0+Twc1B7cW72L+88geG5cW4wIhn7g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "chalk": "^5.4.1",
+        "commander": "^13.1.0",
+        "debug": "^4.4.0",
+        "execa": "^8.0.1",
+        "lilconfig": "^3.1.3",
+        "listr2": "^8.2.5",
+        "micromatch": "^4.0.8",
+        "pidtree": "^0.6.0",
+        "string-argv": "^0.3.2",
+        "yaml": "^2.7.0"
       },
       "bin": {
         "lint-staged": "bin/lint-staged.js"
@@ -5173,15 +5261,6 @@
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
     },
-    "node_modules/lint-staged/node_modules/commander": {
-      "version": "12.1.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-12.1.0.tgz",
-      "integrity": "sha512-Vw8qHK3bZM9y/P10u3Vib8o/DdkvA2OtPtZvD871QKjy74Wj1WSKFILMPRPSdUSx5RFK1arlJzEtA4PkFgnbuA==",
-      "dev": true,
-      "engines": {
-        "node": ">=18"
-      }
-    },
     "node_modules/lint-staged/node_modules/execa": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/execa/-/execa-8.0.1.tgz",
@@ -6179,6 +6258,7 @@
       "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
       "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
       }
@@ -6676,10 +6756,11 @@
       }
     },
     "node_modules/ts-api-utils": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.0.0.tgz",
-      "integrity": "sha512-xCt/TOAc+EOHS1XPnijD3/yzpH6qg2xppZO1YDqGoVsNXfQfzHpOdNuXwrwOU8u4ITXJyDCTyt8w5g1sZv9ynQ==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.0.1.tgz",
+      "integrity": "sha512-dnlgjFSVetynI8nzgJ+qF62efpglpWRk8isUEWZGWlJYySCTD6aKvbUDu+zbPeDakk3bg5H4XpitHukgfL1m9w==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=18.12"
       },
@@ -6688,10 +6769,11 @@
       }
     },
     "node_modules/ts-jest": {
-      "version": "29.2.5",
-      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.2.5.tgz",
-      "integrity": "sha512-KD8zB2aAZrcKIdGk4OwpJggeLcH1FgrICqDSROWqlnJXGCXK4Mn6FcdK2B6670Xr73lHMG1kHw8R87A0ecZ+vA==",
+      "version": "29.2.6",
+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.2.6.tgz",
+      "integrity": "sha512-yTNZVZqc8lSixm+QGVFcPe6+yj7+TWZwIesuOWvfcn4B9bz5x4NDzVCQQjOs7Hfouu36aEqfEbo9Qpo+gq8dDg==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "bs-logger": "^0.2.6",
         "ejs": "^3.1.10",
@@ -6700,7 +6782,7 @@
         "json5": "^2.2.3",
         "lodash.memoize": "^4.1.2",
         "make-error": "^1.3.6",
-        "semver": "^7.6.3",
+        "semver": "^7.7.1",
         "yargs-parser": "^21.1.1"
       },
       "bin": {
@@ -6736,10 +6818,11 @@
       }
     },
     "node_modules/ts-jest/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
+      "version": "7.7.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.1.tgz",
+      "integrity": "sha512-hlq8tAfn0m/61p4BVRcPzIGr6LKiMwo4VM6dGi6pt4qcRkmNzTcWq6eCEjEh+qXjkMDvPlOFFSGwQjoEa6gyMA==",
       "dev": true,
+      "license": "ISC",
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -6781,10 +6864,11 @@
       }
     },
     "node_modules/typedoc": {
-      "version": "0.27.6",
-      "resolved": "https://registry.npmjs.org/typedoc/-/typedoc-0.27.6.tgz",
-      "integrity": "sha512-oBFRoh2Px6jFx366db0lLlihcalq/JzyCVp7Vaq1yphL/tbgx2e+bkpkCgJPunaPvPwoTOXSwasfklWHm7GfAw==",
+      "version": "0.27.9",
+      "resolved": "https://registry.npmjs.org/typedoc/-/typedoc-0.27.9.tgz",
+      "integrity": "sha512-/z585740YHURLl9DN2jCWe6OW7zKYm6VoQ93H0sxZ1cwHQEQrUn5BJrEnkWhfzUdyO+BLGjnKUZ9iz9hKloFDw==",
       "dev": true,
+      "license": "Apache-2.0",
       "dependencies": {
         "@gerrit0/mini-shiki": "^1.24.0",
         "lunr": "^2.3.9",
@@ -6799,7 +6883,7 @@
         "node": ">= 18"
       },
       "peerDependencies": {
-        "typescript": "5.0.x || 5.1.x || 5.2.x || 5.3.x || 5.4.x || 5.5.x || 5.6.x || 5.7.x"
+        "typescript": "5.0.x || 5.1.x || 5.2.x || 5.3.x || 5.4.x || 5.5.x || 5.6.x || 5.7.x || 5.8.x"
       }
     },
     "node_modules/typedoc/node_modules/brace-expansion": {
@@ -6827,9 +6911,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.7.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.2.tgz",
-      "integrity": "sha512-i5t66RHxDvVN40HfDd1PsEThGNnlMCMT3jMUuoh9/0TaqWevNontacunWyN02LA9/fIbEWlcHZcgTKb9QoaLfg==",
+      "version": "5.7.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.3.tgz",
+      "integrity": "sha512-84MVSjMEHP+FQRPy3pX9sTVV/INIex71s9TL2Gm5FG/WG1SqXeKyZ0k7/blY/4FdOzI12CBy1vGc4og/eus0fw==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
@@ -6853,12 +6937,13 @@
       "license": "MIT"
     },
     "node_modules/universalify": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.1.tgz",
+      "integrity": "sha512-gptHNQghINnc/vTGIk0SOFGFNXw7JVrlRUtConJRlvaw6DuX0wO5Jeko9sWrMBhh+PsYAZ7oXAiOnf/UKogyiw==",
       "dev": true,
+      "license": "MIT",
       "engines": {
-        "node": ">= 4.0.0"
+        "node": ">= 10.0.0"
       }
     },
     "node_modules/update-browserslist-db": {
@@ -7096,9 +7181,9 @@
       "dev": true
     },
     "node_modules/yaml": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.6.1.tgz",
-      "integrity": "sha512-7r0XPzioN/Q9kXBro/XPnA6kznR73DHq+GXh5ON7ZozRO6aMjbmiBuKste2wslTFkC5d1dw0GooOCepZXJ2SAg==",
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.7.0.tgz",
+      "integrity": "sha512-+hSoy/QHluxmC9kCIJyL/uyFmLmc+e5CFR5Wa+bpIhIj85LVb9ZH2nVnqrHoSvKogwODv0ClqZkmiSSaIH5LTA==",
       "dev": true,
       "license": "ISC",
       "bin": {
diff --git a/package.json b/package.json
index 76a74a67..f0583776 100644
--- a/package.json
+++ b/package.json
@@ -51,11 +51,11 @@
     "@types/node": "^22.10.1",
     "@typescript-eslint/eslint-plugin": "^8.20.0",
     "@typescript-eslint/parser": "^8.20.0",
-    "esbuild": "^0.24.0",
+    "esbuild": "^0.25.0",
     "eslint": "^9.18.0",
     "eslint-plugin-testing-library": "^7.1.1",
     "fake-indexeddb": "^6.0.0",
-    "globals": "^15.14.0",
+    "globals": "^16.0.0",
     "http-proxy-middleware": "^3.0.3",
     "husky": "^9.1.7",
     "jest": "^29.7.0",
diff --git a/src/OidcClient.ts b/src/OidcClient.ts
index ae12edb7..801a9bbc 100644
--- a/src/OidcClient.ts
+++ b/src/OidcClient.ts
@@ -331,6 +331,7 @@ export class OidcClient {
         id_token_hint,
         client_id,
         request_type,
+        url_state,
         post_logout_redirect_uri = this.settings.post_logout_redirect_uri,
         extraQueryParams = this.settings.extraQueryParams,
     }: CreateSignoutRequestArgs = {}): Promise<SignoutRequest> {
@@ -358,6 +359,7 @@ export class OidcClient {
             state_data: state,
             extraQueryParams,
             request_type,
+            url_state,
         });
 
         // house cleaning
diff --git a/src/SignoutRequest.ts b/src/SignoutRequest.ts
index a310f7dc..2f8795fe 100644
--- a/src/SignoutRequest.ts
+++ b/src/SignoutRequest.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Brock Allen & Dominick Baier. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.
 
-import { Logger } from "./utils";
+import { Logger, URL_STATE_DELIMITER } from "./utils";
 import { State } from "./State";
 
 /**
@@ -22,6 +22,7 @@ export interface SignoutRequestArgs {
     request_type?: string;
     /** custom "state", which can be used by a caller to have "data" round tripped */
     state_data?: unknown;
+    url_state?: string;
 }
 
 /**
@@ -35,7 +36,7 @@ export class SignoutRequest {
 
     public constructor({
         url,
-        state_data, id_token_hint, post_logout_redirect_uri, extraQueryParams, request_type, client_id,
+        state_data, id_token_hint, post_logout_redirect_uri, extraQueryParams, request_type, client_id, url_state,
     }: SignoutRequestArgs) {
         if (!url) {
             this._logger.error("ctor: No url passed");
@@ -53,10 +54,15 @@ export class SignoutRequest {
         if (post_logout_redirect_uri) {
             parsedUrl.searchParams.append("post_logout_redirect_uri", post_logout_redirect_uri);
 
-            if (state_data) {
-                this.state = new State({ data: state_data, request_type });
+            // Add state if either data needs to be stored, or url_state set for an intermediate proxy
+            if (state_data || url_state) {
+                this.state = new State({ data: state_data, request_type, url_state });
 
-                parsedUrl.searchParams.append("state", this.state.id);
+                let stateParam = this.state.id;
+                if (url_state) {
+                    stateParam = `${stateParam}${URL_STATE_DELIMITER}${url_state}`;
+                }
+                parsedUrl.searchParams.append("state", stateParam);
             }
         }
 
diff --git a/src/SignoutResponse.ts b/src/SignoutResponse.ts
index d355734b..9646e0ce 100644
--- a/src/SignoutResponse.ts
+++ b/src/SignoutResponse.ts
@@ -1,6 +1,8 @@
 // Copyright (c) Brock Allen & Dominick Baier. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.
 
+import { URL_STATE_DELIMITER } from "./utils";
+
 /**
  * @public
  * @see https://openid.net/specs/openid-connect-core-1_0.html#AuthError
@@ -18,9 +20,17 @@ export class SignoutResponse {
 
     /** custom state data set during the initial signin request */
     public userState: unknown;
+    public url_state?: string;
 
     public constructor(params: URLSearchParams) {
         this.state = params.get("state");
+        if (this.state) {
+            const splitState = decodeURIComponent(this.state).split(URL_STATE_DELIMITER);
+            this.state = splitState[0];
+            if (splitState.length > 1) {
+                this.url_state = splitState.slice(1).join(URL_STATE_DELIMITER);
+            }
+        }
 
         this.error = params.get("error");
         this.error_description = params.get("error_description");
diff --git a/src/UserManager.ts b/src/UserManager.ts
index 84ee1eba..180def74 100644
--- a/src/UserManager.ts
+++ b/src/UserManager.ts
@@ -25,7 +25,7 @@ export type ExtraSigninRequestArgs = Pick<CreateSigninRequestArgs, "nonce" | "ex
 /**
  * @public
  */
-export type ExtraSignoutRequestArgs = Pick<CreateSignoutRequestArgs, "extraQueryParams" | "state" | "id_token_hint" | "post_logout_redirect_uri">;
+export type ExtraSignoutRequestArgs = Pick<CreateSignoutRequestArgs, "extraQueryParams" | "state" | "id_token_hint" | "post_logout_redirect_uri" | "url_state">;
 
 /**
  * @public


Test patch:
diff --git a/src/OidcClient.test.ts b/src/OidcClient.test.ts
index 6af0e15a..14b0acba 100644
--- a/src/OidcClient.test.ts
+++ b/src/OidcClient.test.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Brock Allen & Dominick Baier. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.
 
-import { CryptoUtils, JwtUtils } from "./utils";
+import { CryptoUtils, JwtUtils, URL_STATE_DELIMITER } from "./utils";
 import type { ErrorResponse } from "./errors";
 import type { JwtClaims } from "./Claims";
 import { OidcClient } from "./OidcClient";
@@ -838,6 +838,7 @@ describe("OidcClient", () => {
                 state: "foo",
                 post_logout_redirect_uri: "bar",
                 id_token_hint: "baz",
+                url_state: "qux",
             });
 
             // assert
@@ -847,6 +848,7 @@ describe("OidcClient", () => {
             expect(url).toContain("http://sts/signout");
             expect(url).toContain("post_logout_redirect_uri=bar");
             expect(url).toContain("id_token_hint=baz");
+            expect(url).toContain(encodeURIComponent(URL_STATE_DELIMITER + "qux"));
         });
 
         it("should pass params to SignoutRequest w/o id_token_hint and client_id", async () => {
diff --git a/src/SignoutRequest.test.ts b/src/SignoutRequest.test.ts
index 3386d551..1d8dbc92 100644
--- a/src/SignoutRequest.test.ts
+++ b/src/SignoutRequest.test.ts
@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.
 
 import { SignoutRequest, type SignoutRequestArgs } from "./SignoutRequest";
+import { URL_STATE_DELIMITER } from "./utils";
 
 describe("SignoutRequest", () => {
 
@@ -70,6 +71,19 @@ describe("SignoutRequest", () => {
             expect(subject.url).toContain("state=" + subject.state!.id);
         });
 
+        it("should include state if post_logout_redirect_uri and url_state provided even if state_data is empty", () => {
+            // arrange
+            delete settings.state_data;
+            settings.url_state = "foo";
+
+            // act
+            subject = new SignoutRequest(settings);
+
+            // assert
+            expect(subject.state).toBeDefined();
+            expect(subject.url).toContain("state=" + subject.state!.id + encodeURIComponent(URL_STATE_DELIMITER + "foo"));
+        });
+
         it("should not include state if no post_logout_redirect_uri provided", () => {
             // arrange
             delete settings.post_logout_redirect_uri;
@@ -80,6 +94,29 @@ describe("SignoutRequest", () => {
             // assert
             expect(subject.url).not.toContain("state=");
         });
+        
+        it("should include url_state", async () => {
+            // arrange
+            settings.url_state = "foo";
+
+            // act
+            subject = new SignoutRequest(settings);
+
+            // assert
+            expect(subject.url).toContain("state=" + subject.state!.id + encodeURIComponent(URL_STATE_DELIMITER + "foo"));
+        });
+
+        it("should not include state or url_state if no post_logout_redirect_uri provided", () => {
+            // arrange
+            delete settings.post_logout_redirect_uri;
+            settings.url_state = "foo";
+
+            // act
+            subject = new SignoutRequest(settings);
+
+            // assert
+            expect(subject.url).not.toContain("state=");
+        });
 
         it("should include id_token_hint, post_logout_redirect_uri, and state", () => {
             // assert
diff --git a/src/SignoutResponse.test.ts b/src/SignoutResponse.test.ts
index 4c0585e5..791a3110 100644
--- a/src/SignoutResponse.test.ts
+++ b/src/SignoutResponse.test.ts
@@ -38,5 +38,14 @@ describe("SignoutResponse", () => {
             // assert
             expect(subject.state).toEqual("foo");
         });
+        
+        it("should read url_state", () => {
+            // act
+            const subject = new SignoutResponse(new URLSearchParams("state=foo;bar"));
+
+            // assert
+            expect(subject.state).toEqual("foo");
+            expect(subject.url_state).toEqual("bar");
+        });
     });
 });
diff --git a/src/UserManager.test.ts b/src/UserManager.test.ts
index c78745c1..15cd6cf0 100644
--- a/src/UserManager.test.ts
+++ b/src/UserManager.test.ts
@@ -1001,6 +1001,7 @@ describe("UserManager", () => {
                 extraQueryParams: { q : "q" },
                 state: "state",
                 post_logout_redirect_uri: "http://app/extra_callback",
+                url_state: "foo",
             };
 
             // act