diff --git a/core/runtime/src/fetch/request.rs b/core/runtime/src/fetch/request.rs
index 17fd3f4528e..e80e4fc8ed1 100644
--- a/core/runtime/src/fetch/request.rs
+++ b/core/runtime/src/fetch/request.rs
@@ -25,6 +25,9 @@ pub struct RequestInit {
     signal: Option<JsObject>,
 }
 
+#[derive(Clone, Copy)]
+struct HasBody;
+
 impl RequestInit {
     /// Takes the abort signal from the options, if present.
     pub fn take_signal(&mut self) -> Option<JsObject> {
@@ -41,9 +44,13 @@ impl RequestInit {
         request: Option<HttpRequest<Vec<u8>>>,
     ) -> JsResult<HttpRequest<Vec<u8>>> {
         let mut builder = HttpRequest::builder();
+        let mut is_get_or_head_method = true;
+        let mut has_inherited_body = false;
         let mut request_body = Vec::new();
         if let Some(r) = request {
             let (parts, body) = r.into_parts();
+            is_get_or_head_method = matches!(parts.method, http::Method::GET | http::Method::HEAD);
+            has_inherited_body = parts.extensions.get::<HasBody>().is_some() || !body.is_empty();
             builder = builder
                 .method(parts.method)
                 .uri(parts.uri)
@@ -62,9 +69,16 @@ impl RequestInit {
         }
 
         if let Some(Convert(ref method)) = self.method.take() {
-            builder = builder.method(method.to_std_string().map_err(
+            let method = method.to_std_string().map_err(
                 |_| js_error!(TypeError: "Request constructor: {} is an invalid method", method.to_std_string_escaped()),
-            )?.as_str());
+            )?;
+            is_get_or_head_method =
+                method.eq_ignore_ascii_case("GET") || method.eq_ignore_ascii_case("HEAD");
+            builder = builder.method(method.as_str());
+        }
+
+        if is_get_or_head_method && (self.body.is_some() || has_inherited_body) {
+            return Err(js_error!(TypeError: "Request with GET/HEAD method cannot have body."));
         }
 
         if let Some(body) = &self.body {
@@ -81,9 +95,13 @@ impl RequestInit {
             }
         }
 
-        builder
+        let mut request = builder
             .body(request_body)
-            .map_err(|_| js_error!(Error: "Cannot construct request"))
+            .map_err(|_| js_error!(Error: "Cannot construct request"))?;
+        if self.body.is_some() || has_inherited_body {
+            request.extensions_mut().insert(HasBody);
+        }
+        Ok(request)
     }
 }
 
diff --git a/core/runtime/src/fetch/tests/request.rs b/core/runtime/src/fetch/tests/request.rs
index 7d516258a0e..549bdb16243 100644
--- a/core/runtime/src/fetch/tests/request.rs
+++ b/core/runtime/src/fetch/tests/request.rs
@@ -5,6 +5,7 @@ use crate::test::{TestAction, run_test_actions};
 use boa_engine::{js_str, js_string};
 use either::Either;
 use http::{Response, Uri};
+use indoc::indoc;
 
 #[test]
 fn request_constructor() {
@@ -48,6 +49,88 @@ fn request_constructor() {
     ]);
 }
 
+#[test]
+fn request_constructor_get_with_body_throws() {
+    run_test_actions([
+        TestAction::inspect_context(|ctx| {
+            let fetcher = TestFetcher::default();
+            crate::fetch::register(fetcher, None, ctx).expect("failed to register fetch");
+        }),
+        TestAction::run(indoc! {r#"
+            try {
+                new Request("http://unit.test", { method: "GET", body: "x" });
+                throw Error("expected the call above to throw");
+            } catch (e) {
+                if (!(e instanceof TypeError)) {
+                    throw e;
+                }
+            }
+        "#}),
+    ]);
+}
+
+#[test]
+fn request_constructor_head_with_body_throws() {
+    run_test_actions([
+        TestAction::inspect_context(|ctx| {
+            let fetcher = TestFetcher::default();
+            crate::fetch::register(fetcher, None, ctx).expect("failed to register fetch");
+        }),
+        TestAction::run(indoc! {r#"
+            try {
+                new Request("http://unit.test", { method: "HEAD", body: "x" });
+                throw Error("expected the call above to throw");
+            } catch (e) {
+                if (!(e instanceof TypeError)) {
+                    throw e;
+                }
+            }
+        "#}),
+    ]);
+}
+
+#[test]
+fn request_constructor_get_with_inherited_empty_body_throws() {
+    run_test_actions([
+        TestAction::inspect_context(|ctx| {
+            let fetcher = TestFetcher::default();
+            crate::fetch::register(fetcher, None, ctx).expect("failed to register fetch");
+        }),
+        TestAction::run(indoc! {r#"
+            const request = new Request("http://unit.test", { method: "POST", body: "" });
+            try {
+                new Request(request, { method: "GET" });
+                throw Error("expected the call above to throw");
+            } catch (e) {
+                if (!(e instanceof TypeError)) {
+                    throw e;
+                }
+            }
+        "#}),
+    ]);
+}
+
+#[test]
+fn request_constructor_head_with_inherited_empty_body_throws() {
+    run_test_actions([
+        TestAction::inspect_context(|ctx| {
+            let fetcher = TestFetcher::default();
+            crate::fetch::register(fetcher, None, ctx).expect("failed to register fetch");
+        }),
+        TestAction::run(indoc! {r#"
+            const request = new Request("http://unit.test", { method: "POST", body: "" });
+            try {
+                new Request(request, { method: "HEAD" });
+                throw Error("expected the call above to throw");
+            } catch (e) {
+                if (!(e instanceof TypeError)) {
+                    throw e;
+                }
+            }
+        "#}),
+    ]);
+}
+
 #[test]
 fn request_clone_preserves_body_without_override() {
     run_test_actions([