From 8bc23bbf31c62ef59e638c43bddcee798a5b7724 Mon Sep 17 00:00:00 2001
From: Deepak Ganesh <deepakganesh78@gmail.com>
Date: Sun, 26 Jul 2026 15:46:14 +0530
Subject: [PATCH] Detect XML structured suffix response types

Treat RSS, Atom, XHTML, SVG, and other +xml media types as text while preserving JSON, event stream, and binary detection.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 src/utils.ts       |  7 ++++++-
 test/index.test.ts | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/utils.ts b/src/utils.ts
index 3bc0dbf5..e5f65287 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -50,6 +50,7 @@ const textTypes = new Set([
 ]);
 
 const JSON_RE = /^application\/(?:[\w!#$%&*.^`~-]*\+)?json(;.+)?$/i;
+const XML_RE = /^(?:application|image)\/(?:[\w!#$%&*.^`~-]+\+)?xml$/i;
 
 // This provides reasonable defaults for the correct parser based on Content-Type header.
 export function detectResponseType(_contentType = ""): ResponseType {
@@ -75,7 +76,11 @@ export function detectResponseType(_contentType = ""): ResponseType {
     return "stream";
   }
 
-  if (textTypes.has(contentType) || contentType.startsWith("text/")) {
+  if (
+    XML_RE.test(contentType) ||
+    textTypes.has(contentType) ||
+    contentType.startsWith("text/")
+  ) {
     return "text";
   }
 
diff --git a/test/index.test.ts b/test/index.test.ts
index 5ac20b07..87692156 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -10,6 +10,28 @@ import {
 import { Readable } from "node:stream";
 import { H3, HTTPError, readBody, serve } from "h3";
 import { $fetch } from "../src/index.ts";
+import { detectResponseType } from "../src/utils.ts";
+
+describe("detectResponseType", () => {
+  it.each([
+    "application/xml",
+    "application/rss+xml",
+    "application/atom+xml",
+    "application/xhtml+xml",
+    "image/svg+xml",
+    "text/xml",
+    "application/soap+xml; charset=utf-8",
+    "APPLICATION/RSS+XML",
+  ])("detects %s as text", (contentType) => {
+    expect(detectResponseType(contentType)).to.equal("text");
+  });
+
+  it("preserves other response type detection", () => {
+    expect(detectResponseType("application/octet-stream")).to.equal("blob");
+    expect(detectResponseType("application/ld+json")).to.equal("json");
+    expect(detectResponseType("text/event-stream")).to.equal("stream");
+  });
+});
 
 describe("ofetch", () => {
   let listener: ReturnType<typeof serve>;