[codex] preserve HTTP proxy path delimiters

lib/utils/resolve-file-proxy.ts

@@ -53,11 +53,7 @@ async function resolveHttpProxy(
   httpTargetUrl: string,
   relativePath: string,
 ): Promise<Response> {
-  // Ensure the URL doesn't have double slashes
-  const baseUrl = httpTargetUrl.endsWith("/")
-    ? httpTargetUrl.slice(0, -1)
-    : httpTargetUrl
-  const targetUrl = `${baseUrl}/${relativePath}`
+  const targetUrl = buildHttpProxyUrl(httpTargetUrl, relativePath)
 
   try {
     const response = await fetch(targetUrl)
@@ -91,6 +87,18 @@ async function resolveHttpProxy(
   }
 }
 
+export function buildHttpProxyUrl(
+  httpTargetUrl: string,
+  relativePath: string,
+): URL {
+  const baseUrl = new URL(httpTargetUrl)
+  if (!baseUrl.pathname.endsWith("/")) {
+    baseUrl.pathname += "/"
+  }
+  baseUrl.pathname += relativePath
+  return baseUrl
+}
+
 function getContentType(fileName: string): string {
   const ext = fileName.split(".").pop()?.toLowerCase()
   const mimeTypes: Record<string, string> = {

tests/routes/file-proxy03.test.ts

@@ -1,6 +1,18 @@
 import { test, expect } from "bun:test"
 import { getTestServer } from "tests/fixtures/get-test-server"
 import { Buffer } from "node:buffer"
+import { buildHttpProxyUrl } from "lib/utils/resolve-file-proxy"
+
+test("http proxy URL preserves special characters as path data", () => {
+  const targetUrl = buildHttpProxyUrl(
+    "https://example.com/files/static/source?token=abc",
+    "folder name/report?final#1.txt",
+  )
+
+  expect(targetUrl.toString()).toBe(
+    "https://example.com/files/static/source/folder%20name/report%3Ffinal%231.txt?token=abc",
+  )
+})
 
 test("http proxy file resolution", async () => {
   const { axios, url } = await getTestServer()
@@ -78,6 +90,28 @@ test("http proxy with query param download", async () => {
   expect(downloadRes.data).toBe("Query param HTTP proxy test")
 })
 
+test("http proxy downloads paths containing URL delimiters", async () => {
+  const { axios, url } = await getTestServer()
+
+  await axios.post("/files/upsert", {
+    file_path: "/special-source/report?final#1.txt",
+    text_content: "Special path HTTP proxy test",
+  })
+
+  await axios.post("/file_proxies/create", {
+    proxy_type: "http",
+    http_target_url: `${url}/files/static/special-source`,
+    matching_pattern: "http-special/*",
+  })
+
+  const downloadRes = await axios.get("/files/download", {
+    params: { file_path: "/http-special/report?final#1.txt" },
+  })
+
+  expect(downloadRes.status).toBe(200)
+  expect(downloadRes.data).toBe("Special path HTTP proxy test")
+})
+
 test("http proxy binary file", async () => {
   const { axios, url } = await getTestServer()