diff --git a/lib/analyze-action.js b/lib/analyze-action.js
index 824999309..c7e6b7b1a 100644
--- a/lib/analyze-action.js
+++ b/lib/analyze-action.js
@@ -90236,6 +90236,14 @@ function getApiDetails() {
 function getApiClient() {
   return createApiClientWithDetails(getApiDetails());
 }
+function getAuthorizationHeaderFor(logger, apiDetails, url2) {
+  if (url2.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && url2.startsWith(`${apiDetails.apiURL}/`)) {
+    logger.debug(`Providing an authorization token.`);
+    return `token ${apiDetails.auth}`;
+  }
+  logger.debug(`Not using an authorization token.`);
+  return void 0;
+}
 var cachedGitHubVersion = void 0;
 async function getGitHubVersionFromApi(apiClient, apiDetails) {
   if (parseGitHubUrl(apiDetails.url) === GITHUB_DOTCOM_URL) {
@@ -92429,11 +92437,12 @@ var downloadCodeQL = async function(codeqlURL, compressionMethod, maybeBundleVer
   let authorization = void 0;
   if (searchParams.has("token")) {
     logger.debug("CodeQL tools URL contains an authorization token.");
-  } else if (codeqlURL.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && codeqlURL.startsWith(`${apiDetails.apiURL}/`)) {
-    logger.debug("Providing an authorization token to download CodeQL tools.");
-    authorization = `token ${apiDetails.auth}`;
   } else {
-    logger.debug("Downloading CodeQL tools without an authorization token.");
+    authorization = getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      codeqlURL
+    );
   }
   const toolcacheInfo = getToolcacheDestinationInfo(
     maybeBundleVersion,
diff --git a/lib/init-action-post.js b/lib/init-action-post.js
index 95092c298..65dadeb7d 100644
--- a/lib/init-action-post.js
+++ b/lib/init-action-post.js
@@ -128455,6 +128455,14 @@ function getApiDetails() {
 function getApiClient() {
   return createApiClientWithDetails(getApiDetails());
 }
+function getAuthorizationHeaderFor(logger, apiDetails, url2) {
+  if (url2.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && url2.startsWith(`${apiDetails.apiURL}/`)) {
+    logger.debug(`Providing an authorization token.`);
+    return `token ${apiDetails.auth}`;
+  }
+  logger.debug(`Not using an authorization token.`);
+  return void 0;
+}
 var cachedGitHubVersion = void 0;
 async function getGitHubVersionFromApi(apiClient, apiDetails) {
   if (parseGitHubUrl(apiDetails.url) === GITHUB_DOTCOM_URL) {
@@ -130372,11 +130380,12 @@ var downloadCodeQL = async function(codeqlURL, compressionMethod, maybeBundleVer
   let authorization = void 0;
   if (searchParams.has("token")) {
     logger.debug("CodeQL tools URL contains an authorization token.");
-  } else if (codeqlURL.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && codeqlURL.startsWith(`${apiDetails.apiURL}/`)) {
-    logger.debug("Providing an authorization token to download CodeQL tools.");
-    authorization = `token ${apiDetails.auth}`;
   } else {
-    logger.debug("Downloading CodeQL tools without an authorization token.");
+    authorization = getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      codeqlURL
+    );
   }
   const toolcacheInfo = getToolcacheDestinationInfo(
     maybeBundleVersion,
diff --git a/lib/init-action.js b/lib/init-action.js
index 6e66bea73..e8cd76dc9 100644
--- a/lib/init-action.js
+++ b/lib/init-action.js
@@ -86091,6 +86091,14 @@ function getApiClient() {
 function getApiClientWithExternalAuth(apiDetails) {
   return createApiClientWithDetails(apiDetails, { allowExternal: true });
 }
+function getAuthorizationHeaderFor(logger, apiDetails, url) {
+  if (url.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && url.startsWith(`${apiDetails.apiURL}/`)) {
+    logger.debug(`Providing an authorization token.`);
+    return `token ${apiDetails.auth}`;
+  }
+  logger.debug(`Not using an authorization token.`);
+  return void 0;
+}
 var cachedGitHubVersion = void 0;
 async function getGitHubVersionFromApi(apiClient, apiDetails) {
   if (parseGitHubUrl(apiDetails.url) === GITHUB_DOTCOM_URL) {
@@ -89201,11 +89209,12 @@ var downloadCodeQL = async function(codeqlURL, compressionMethod, maybeBundleVer
   let authorization = void 0;
   if (searchParams.has("token")) {
     logger.debug("CodeQL tools URL contains an authorization token.");
-  } else if (codeqlURL.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && codeqlURL.startsWith(`${apiDetails.apiURL}/`)) {
-    logger.debug("Providing an authorization token to download CodeQL tools.");
-    authorization = `token ${apiDetails.auth}`;
   } else {
-    logger.debug("Downloading CodeQL tools without an authorization token.");
+    authorization = getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      codeqlURL
+    );
   }
   const toolcacheInfo = getToolcacheDestinationInfo(
     maybeBundleVersion,
diff --git a/lib/start-proxy-action.js b/lib/start-proxy-action.js
index 236373615..32691c1cc 100644
--- a/lib/start-proxy-action.js
+++ b/lib/start-proxy-action.js
@@ -49356,17 +49356,8 @@ var persistInputs = function() {
   core4.saveState(persistedInputsKey, JSON.stringify(inputEnvironmentVariables));
 };
 
-// src/logging.ts
-var core5 = __toESM(require_core());
-function getActionsLogger() {
-  return core5;
-}
-
-// src/start-proxy.ts
-var core7 = __toESM(require_core());
-
 // src/api-client.ts
-var core6 = __toESM(require_core());
+var core5 = __toESM(require_core());
 var githubUtils = __toESM(require_utils4());
 var retry = __toESM(require_dist_node15());
 var import_console_log_level = __toESM(require_console_log_level());
@@ -49391,6 +49382,23 @@ function getApiDetails() {
 function getApiClient() {
   return createApiClientWithDetails(getApiDetails());
 }
+function getAuthorizationHeaderFor(logger, apiDetails, url) {
+  if (url.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && url.startsWith(`${apiDetails.apiURL}/`)) {
+    logger.debug(`Providing an authorization token.`);
+    return `token ${apiDetails.auth}`;
+  }
+  logger.debug(`Not using an authorization token.`);
+  return void 0;
+}
+
+// src/logging.ts
+var core6 = __toESM(require_core());
+function getActionsLogger() {
+  return core6;
+}
+
+// src/start-proxy.ts
+var core7 = __toESM(require_core());
 
 // src/defaults.json
 var bundleVersion = "codeql-bundle-v2.23.1";
@@ -49682,10 +49690,16 @@ async function getProxyBinaryPath(logger) {
   const proxyInfo = await getDownloadUrl(logger);
   let proxyBin = toolcache.find(proxyFileName, proxyInfo.version);
   if (!proxyBin) {
+    const apiDetails = getApiDetails();
+    const authorization = getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      proxyInfo.url
+    );
     const temp = await toolcache.downloadTool(
       proxyInfo.url,
       void 0,
-      void 0,
+      authorization,
       {
         accept: "application/octet-stream"
       }
diff --git a/lib/upload-lib.js b/lib/upload-lib.js
index e44738503..78ccf503c 100644
--- a/lib/upload-lib.js
+++ b/lib/upload-lib.js
@@ -88582,6 +88582,14 @@ function getApiDetails() {
 function getApiClient() {
   return createApiClientWithDetails(getApiDetails());
 }
+function getAuthorizationHeaderFor(logger, apiDetails, url2) {
+  if (url2.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && url2.startsWith(`${apiDetails.apiURL}/`)) {
+    logger.debug(`Providing an authorization token.`);
+    return `token ${apiDetails.auth}`;
+  }
+  logger.debug(`Not using an authorization token.`);
+  return void 0;
+}
 var cachedGitHubVersion = void 0;
 async function getGitHubVersionFromApi(apiClient, apiDetails) {
   if (parseGitHubUrl(apiDetails.url) === GITHUB_DOTCOM_URL) {
@@ -90200,11 +90208,12 @@ var downloadCodeQL = async function(codeqlURL, compressionMethod, maybeBundleVer
   let authorization = void 0;
   if (searchParams.has("token")) {
     logger.debug("CodeQL tools URL contains an authorization token.");
-  } else if (codeqlURL.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && codeqlURL.startsWith(`${apiDetails.apiURL}/`)) {
-    logger.debug("Providing an authorization token to download CodeQL tools.");
-    authorization = `token ${apiDetails.auth}`;
   } else {
-    logger.debug("Downloading CodeQL tools without an authorization token.");
+    authorization = getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      codeqlURL
+    );
   }
   const toolcacheInfo = getToolcacheDestinationInfo(
     maybeBundleVersion,
diff --git a/lib/upload-sarif-action.js b/lib/upload-sarif-action.js
index a08877c14..88e26e3ca 100644
--- a/lib/upload-sarif-action.js
+++ b/lib/upload-sarif-action.js
@@ -88834,6 +88834,14 @@ function getApiDetails() {
 function getApiClient() {
   return createApiClientWithDetails(getApiDetails());
 }
+function getAuthorizationHeaderFor(logger, apiDetails, url2) {
+  if (url2.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && url2.startsWith(`${apiDetails.apiURL}/`)) {
+    logger.debug(`Providing an authorization token.`);
+    return `token ${apiDetails.auth}`;
+  }
+  logger.debug(`Not using an authorization token.`);
+  return void 0;
+}
 var cachedGitHubVersion = void 0;
 async function getGitHubVersionFromApi(apiClient, apiDetails) {
   if (parseGitHubUrl(apiDetails.url) === GITHUB_DOTCOM_URL) {
@@ -90901,11 +90909,12 @@ var downloadCodeQL = async function(codeqlURL, compressionMethod, maybeBundleVer
   let authorization = void 0;
   if (searchParams.has("token")) {
     logger.debug("CodeQL tools URL contains an authorization token.");
-  } else if (codeqlURL.startsWith(`${apiDetails.url}/`) || apiDetails.apiURL && codeqlURL.startsWith(`${apiDetails.apiURL}/`)) {
-    logger.debug("Providing an authorization token to download CodeQL tools.");
-    authorization = `token ${apiDetails.auth}`;
   } else {
-    logger.debug("Downloading CodeQL tools without an authorization token.");
+    authorization = getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      codeqlURL
+    );
   }
   const toolcacheInfo = getToolcacheDestinationInfo(
     maybeBundleVersion,
diff --git a/src/api-client.ts b/src/api-client.ts
index 8e4a30c57..86134b7f8 100644
--- a/src/api-client.ts
+++ b/src/api-client.ts
@@ -4,6 +4,7 @@ import * as retry from "@octokit/plugin-retry";
 import consoleLogLevel from "console-log-level";
 
 import { getActionVersion, getRequiredInput } from "./actions-util";
+import { Logger } from "./logging";
 import { getRepositoryNwo, RepositoryNwo } from "./repository";
 import {
   ConfigurationError,
@@ -54,7 +55,7 @@ function createApiClientWithDetails(
   );
 }
 
-export function getApiDetails() {
+export function getApiDetails(): GitHubApiDetails {
   return {
     auth: getRequiredInput("token"),
     url: getRequiredEnvParam("GITHUB_SERVER_URL"),
@@ -72,6 +73,36 @@ export function getApiClientWithExternalAuth(
   return createApiClientWithDetails(apiDetails, { allowExternal: true });
 }
 
+/**
+ * Gets a value for the `Authorization` header for a request to `url`; or `undefined` if the
+ * `Authorization` header should not be set for `url`.
+ *
+ * @param logger The logger to use for debugging messages.
+ * @param apiDetails Details of the GitHub API we are using.
+ * @param url The URL for which we want to add an `Authorization` header.
+ *
+ * @returns The value for the `Authorization` header or `undefined` if it shouldn't be populated.
+ */
+export function getAuthorizationHeaderFor(
+  logger: Logger,
+  apiDetails: GitHubApiDetails,
+  url: string,
+): string | undefined {
+  // We only want to provide an authorization header if we are downloading
+  // from the same GitHub instance the Action is running on.
+  // This avoids leaking Enterprise tokens to dotcom.
+  if (
+    url.startsWith(`${apiDetails.url}/`) ||
+    (apiDetails.apiURL && url.startsWith(`${apiDetails.apiURL}/`))
+  ) {
+    logger.debug(`Providing an authorization token.`);
+    return `token ${apiDetails.auth}`;
+  }
+
+  logger.debug(`Not using an authorization token.`);
+  return undefined;
+}
+
 let cachedGitHubVersion: GitHubVersion | undefined = undefined;
 
 export async function getGitHubVersionFromApi(
diff --git a/src/setup-codeql.ts b/src/setup-codeql.ts
index 5a0f671fa..e147a3112 100644
--- a/src/setup-codeql.ts
+++ b/src/setup-codeql.ts
@@ -567,21 +567,17 @@ export const downloadCodeQL = async function (
   const headers: OutgoingHttpHeaders = {
     accept: "application/octet-stream",
   };
-  // We only want to provide an authorization header if we are downloading
-  // from the same GitHub instance the Action is running on.
-  // This avoids leaking Enterprise tokens to dotcom.
-  // We also don't want to send an authorization header if there's already a token provided in the URL.
   let authorization: string | undefined = undefined;
+
+  // We don't want to send an authorization header if there's already a token provided in the URL.
   if (searchParams.has("token")) {
     logger.debug("CodeQL tools URL contains an authorization token.");
-  } else if (
-    codeqlURL.startsWith(`${apiDetails.url}/`) ||
-    (apiDetails.apiURL && codeqlURL.startsWith(`${apiDetails.apiURL}/`))
-  ) {
-    logger.debug("Providing an authorization token to download CodeQL tools.");
-    authorization = `token ${apiDetails.auth}`;
   } else {
-    logger.debug("Downloading CodeQL tools without an authorization token.");
+    authorization = api.getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      codeqlURL,
+    );
   }
 
   const toolcacheInfo = getToolcacheDestinationInfo(
diff --git a/src/start-proxy-action.ts b/src/start-proxy-action.ts
index c0a8d3c7f..9592b904b 100644
--- a/src/start-proxy-action.ts
+++ b/src/start-proxy-action.ts
@@ -6,6 +6,7 @@ import * as toolcache from "@actions/tool-cache";
 import { pki } from "node-forge";
 
 import * as actionsUtil from "./actions-util";
+import { getApiDetails, getAuthorizationHeaderFor } from "./api-client";
 import { getActionsLogger, Logger } from "./logging";
 import {
   Credential,
@@ -192,10 +193,16 @@ async function getProxyBinaryPath(logger: Logger): Promise<string> {
 
   let proxyBin = toolcache.find(proxyFileName, proxyInfo.version);
   if (!proxyBin) {
+    const apiDetails = getApiDetails();
+    const authorization = getAuthorizationHeaderFor(
+      logger,
+      apiDetails,
+      proxyInfo.url,
+    );
     const temp = await toolcache.downloadTool(
       proxyInfo.url,
       undefined,
-      undefined,
+      authorization,
       {
         accept: "application/octet-stream",
       },