diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp
index 98c7cb91cd..2cf23df0b6 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp
@@ -8,13 +8,13 @@
 
 namespace Web::Fetch::Infrastructure {
 
-Body::Body(ReadableStreamDummy stream)
-    : m_stream(stream)
+Body::Body(JS::Handle<Streams::ReadableStream> stream)
+    : m_stream(move(stream))
 {
 }
 
-Body::Body(ReadableStreamDummy stream, SourceType source, Optional<u64> length)
-    : m_stream(stream)
+Body::Body(JS::Handle<Streams::ReadableStream> stream, SourceType source, Optional<u64> length)
+    : m_stream(move(stream))
     , m_source(move(source))
     , m_length(move(length))
 {
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h
index 8f4dfcad4e..815f62e08e 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h
@@ -13,6 +13,7 @@
 #include <AK/Variant.h>
 #include <LibJS/Heap/Handle.h>
 #include <LibWeb/FileAPI/Blob.h>
+#include <LibWeb/Streams/ReadableStream.h>
 
 namespace Web::Fetch::Infrastructure {
 
@@ -21,20 +22,17 @@ class Body final {
 public:
     using SourceType = Variant<Empty, ByteBuffer, JS::Handle<FileAPI::Blob>>;
 
-    struct ReadableStreamDummy { };
+    explicit Body(JS::Handle<Streams::ReadableStream>);
+    Body(JS::Handle<Streams::ReadableStream>, SourceType, Optional<u64>);
 
-    explicit Body(ReadableStreamDummy);
-    Body(ReadableStreamDummy, SourceType, Optional<u64>);
-
-    [[nodiscard]] ReadableStreamDummy const& stream() { return m_stream; }
+    [[nodiscard]] JS::NonnullGCPtr<Streams::ReadableStream> stream() { return *m_stream; }
     [[nodiscard]] SourceType const& source() const { return m_source; }
     [[nodiscard]] Optional<u64> const& length() const { return m_length; }
 
 private:
     // https://fetch.spec.whatwg.org/#concept-body-stream
     // A stream (a ReadableStream object).
-    // FIXME: Just a placeholder for now.
-    ReadableStreamDummy m_stream;
+    JS::Handle<Streams::ReadableStream> m_stream;
 
     // https://fetch.spec.whatwg.org/#concept-body-source
     // A source (null, a byte sequence, a Blob object, or a FormData object), initially null.
diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
index 80b5e025cd..d67b89fb5c 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
@@ -270,10 +270,12 @@ Optional<StringView> XMLHttpRequest::get_final_encoding() const
 
 // https://fetch.spec.whatwg.org/#concept-bodyinit-extract
 // FIXME: The parameter 'body_init' should be 'typedef (ReadableStream or XMLHttpRequestBodyInit) BodyInit'. For now we just let it be 'XMLHttpRequestBodyInit'.
-static ErrorOr<Fetch::Infrastructure::BodyWithType> extract_body(Fetch::XMLHttpRequestBodyInit const& body_init)
+static ErrorOr<Fetch::Infrastructure::BodyWithType> extract_body(JS::Realm& realm, Fetch::XMLHttpRequestBodyInit const& body_init)
 {
+    auto& window = verify_cast<HTML::Window>(realm.global_object());
+
     // FIXME: 1. Let stream be object if object is a ReadableStream object. Otherwise, let stream be a new ReadableStream, and set up stream.
-    Fetch::Infrastructure::Body::ReadableStreamDummy stream {};
+    auto* stream = realm.heap().allocate<Streams::ReadableStream>(realm, window);
     // FIXME: 2. Let action be null.
     // 3. Let source be null.
     Fetch::Infrastructure::Body::SourceType source {};
@@ -321,7 +323,7 @@ static ErrorOr<Fetch::Infrastructure::BodyWithType> extract_body(Fetch::XMLHttpR
     // FIXME: 8. If action is non-null, then run these steps in in parallel:
 
     // 9. Let body be a body whose stream is stream, source is source, and length is length.
-    auto body = Fetch::Infrastructure::Body { move(stream), move(source), move(length) };
+    auto body = Fetch::Infrastructure::Body { JS::make_handle(stream), move(source), move(length) };
     // 10. Return (body, type).
     return Fetch::Infrastructure::BodyWithType { .body = move(body), .type = move(type) };
 }
@@ -455,6 +457,9 @@ DOM::ExceptionOr<void> XMLHttpRequest::open(String const& method_string, String
 // https://xhr.spec.whatwg.org/#dom-xmlhttprequest-send
 DOM::ExceptionOr<void> XMLHttpRequest::send(Optional<Fetch::XMLHttpRequestBodyInit> body)
 {
+    auto& vm = this->vm();
+    auto& realm = *vm.current_realm();
+
     if (m_ready_state != ReadyState::Opened)
         return DOM::InvalidStateError::create(global_object(), "XHR readyState is not OPENED");
 
@@ -465,7 +470,7 @@ DOM::ExceptionOr<void> XMLHttpRequest::send(Optional<Fetch::XMLHttpRequestBodyIn
     if (m_method.is_one_of("GET"sv, "HEAD"sv))
         body = {};
 
-    auto body_with_type = body.has_value() ? TRY_OR_RETURN_OOM(global_object(), extract_body(body.value())) : Optional<Fetch::Infrastructure::BodyWithType> {};
+    auto body_with_type = body.has_value() ? TRY_OR_RETURN_OOM(global_object(), extract_body(realm, body.value())) : Optional<Fetch::Infrastructure::BodyWithType> {};
 
     AK::URL request_url = m_window->associated_document().parse_url(m_url.to_string());
     dbgln("XHR send from {} to {}", m_window->associated_document().url(), request_url);