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diff --git a/src/bun.js/bindings/webcore/FetchHeaders.h b/src/bun.js/bindings/webcore/FetchHeaders.h
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+++ b/src/bun.js/bindings/webcore/FetchHeaders.h
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+/*
+ * Copyright (C) 2016 Canon Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted, provided that the following conditions
+ * are required to be met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Canon Inc. nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CANON INC. AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL CANON INC. AND ITS CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "ExceptionOr.h"
+#include "HTTPHeaderMap.h"
+#include <variant>
+#include <wtf/HashTraits.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class FetchHeaders : public RefCounted<FetchHeaders> {
+public:
+    enum class Guard {
+        None,
+        Immutable,
+        Request,
+        RequestNoCors,
+        Response
+    };
+
+    using Init = std::variant<Vector<Vector<String>>, Vector<KeyValuePair<String, String>>>;
+    static ExceptionOr<Ref<FetchHeaders>> create(std::optional<Init>&&);
+
+    static Ref<FetchHeaders> create(Guard guard = Guard::None, HTTPHeaderMap&& headers = {}) { return adoptRef(*new FetchHeaders { guard, WTFMove(headers) }); }
+    static Ref<FetchHeaders> create(const FetchHeaders& headers) { return adoptRef(*new FetchHeaders { headers }); }
+
+    ExceptionOr<void> append(const String& name, const String& value);
+    ExceptionOr<void> remove(const String&);
+    ExceptionOr<String> get(const String&) const;
+    ExceptionOr<bool> has(const String&) const;
+    ExceptionOr<void> set(const String& name, const String& value);
+
+    ExceptionOr<void> fill(const Init&);
+    ExceptionOr<void> fill(const FetchHeaders&);
+    void filterAndFill(const HTTPHeaderMap&, Guard);
+
+    inline uint32_t size()
+    {
+        return m_headers.size();
+    }
+
+    String fastGet(HTTPHeaderName name) const { return m_headers.get(name); }
+    bool fastHas(HTTPHeaderName name) const { return m_headers.contains(name); }
+    void fastSet(HTTPHeaderName name, const String& value) { m_headers.set(name, value); }
+
+    class Iterator {
+    public:
+        explicit Iterator(FetchHeaders&);
+        std::optional<KeyValuePair<String, String>> next();
+
+    private:
+        Ref<FetchHeaders> m_headers;
+        size_t m_currentIndex { 0 };
+        Vector<String> m_keys;
+    };
+    Iterator createIterator() { return Iterator { *this }; }
+
+    void setInternalHeaders(HTTPHeaderMap&& headers) { m_headers = WTFMove(headers); }
+    const HTTPHeaderMap& internalHeaders() const { return m_headers; }
+
+    void setGuard(Guard);
+    Guard guard() const { return m_guard; }
+
+    FetchHeaders(Guard, HTTPHeaderMap&&);
+    explicit FetchHeaders(const FetchHeaders&);
+
+private:
+    Guard m_guard;
+    HTTPHeaderMap m_headers;
+};
+
+inline FetchHeaders::FetchHeaders(Guard guard, HTTPHeaderMap&& headers)
+    : m_guard(guard)
+    , m_headers(WTFMove(headers))
+{
+}
+
+inline FetchHeaders::FetchHeaders(const FetchHeaders& other)
+    : RefCounted<FetchHeaders>()
+    , m_guard(other.m_guard)
+    , m_headers(other.m_headers)
+{
+}
+
+inline void FetchHeaders::setGuard(Guard guard)
+{
+    ASSERT(!m_headers.size());
+    m_guard = guard;
+}
+
+} // namespace WebCore
+
+namespace WTF {
+
+template<> struct EnumTraits<WebCore::FetchHeaders::Guard> {
+    using values = EnumValues<
+        WebCore::FetchHeaders::Guard,
+        WebCore::FetchHeaders::Guard::None,
+        WebCore::FetchHeaders::Guard::Immutable,
+        WebCore::FetchHeaders::Guard::Request,
+        WebCore::FetchHeaders::Guard::RequestNoCors,
+        WebCore::FetchHeaders::Guard::Response>;
+};
+
+}