diff --git a/.changeset/healthy-ghosts-look.md b/.changeset/healthy-ghosts-look.md
new file mode 100644
index 0000000000..70c565bf87
--- /dev/null
+++ b/.changeset/healthy-ghosts-look.md
@@ -0,0 +1,5 @@
+---
+'graphql-yoga': patch
+---
+
+Do not return 404 when using query params or trailing slashes
diff --git a/packages/graphql-yoga/__tests__/requests.spec.ts b/packages/graphql-yoga/__tests__/requests.spec.ts
index fde0b29091..a4d7be03f9 100644
--- a/packages/graphql-yoga/__tests__/requests.spec.ts
+++ b/packages/graphql-yoga/__tests__/requests.spec.ts
@@ -55,6 +55,42 @@ describe('requests', () => {
     expect(body.data.requestUrl).toBe('http://yoga/v1/mypath');
   });
 
+  it('supports trailing slash in url', async () => {
+    const yoga = createYoga({
+      schema,
+      logging: false,
+      graphqlEndpoint: '/graphql',
+    });
+    const response = await yoga.fetch('http://yoga/graphql/', {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({ query: '{ requestUrl }' }),
+    });
+
+    expect(response.status).toBe(200);
+    const body = await response.json();
+    expect(body.errors).toBeUndefined();
+    expect(body.data.requestUrl).toBe('http://yoga/graphql/');
+  });
+
+  it('supports query params in url', async () => {
+    const yoga = createYoga({
+      schema,
+      logging: false,
+      graphqlEndpoint: '/graphql',
+    });
+    const response = await yoga.fetch('http://yoga/graphql?query=something+awesome', {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({ query: '{ requestUrl }' }),
+    });
+
+    expect(response.status).toBe(200);
+    const body = await response.json();
+    expect(body.errors).toBeUndefined();
+    expect(body.data.requestUrl).toBe('http://yoga/graphql?query=something+awesome');
+  });
+
   it('allows you to bypass endpoint check with wildcard', async () => {
     const yoga = createYoga({
       schema,
diff --git a/packages/graphql-yoga/src/plugins/use-graphiql.spec.ts b/packages/graphql-yoga/src/plugins/use-graphiql.spec.ts
index 71b7bb7f25..4ed45ca0f2 100644
--- a/packages/graphql-yoga/src/plugins/use-graphiql.spec.ts
+++ b/packages/graphql-yoga/src/plugins/use-graphiql.spec.ts
@@ -30,5 +30,33 @@ describe('GraphiQL', () => {
       expect(response.headers.get('content-type')).not.toEqual('text/html');
       expect(response.status).toEqual(406);
     });
+
+    it('returns graphiql when passing query params and trailing slash', async () => {
+      const yoga = createYoga({
+        graphiql: () => Promise.resolve({ title: 'Test GraphiQL' }),
+      });
+      const responseWithQueryParams = await yoga.fetch(
+        'http://localhost:3000/graphql?query=something+awesome',
+        {
+          method: 'GET',
+          headers: {
+            Accept: 'text/html',
+          },
+        },
+      );
+      expect(responseWithQueryParams.headers.get('content-type')).toEqual('text/html');
+      const resultWithQueryParams = await responseWithQueryParams.text();
+      expect(resultWithQueryParams).toMatch(/<title>Test GraphiQL<\/title>/);
+
+      const responseWithTrailingSlash = await yoga.fetch('http://localhost:3000/graphql/', {
+        method: 'GET',
+        headers: {
+          Accept: 'text/html',
+        },
+      });
+      expect(responseWithTrailingSlash.headers.get('content-type')).toEqual('text/html');
+      const resultWithTrailingSlash = await responseWithTrailingSlash.text();
+      expect(resultWithTrailingSlash).toMatch(/<title>Test GraphiQL<\/title>/);
+    });
   });
 });
diff --git a/packages/graphql-yoga/src/plugins/use-graphiql.ts b/packages/graphql-yoga/src/plugins/use-graphiql.ts
index 08dd5790b9..3e4eba59bf 100644
--- a/packages/graphql-yoga/src/plugins/use-graphiql.ts
+++ b/packages/graphql-yoga/src/plugins/use-graphiql.ts
@@ -98,9 +98,11 @@ export function useGraphiQL<TServerContext extends Record<string, any>>(
   };
   return {
     async onRequest({ request, serverContext, fetchAPI, endResponse, url }) {
+      const requestedUrl = request.url.split('?')[0];
       if (
         shouldRenderGraphiQL(request) &&
-        (request.url.endsWith(config.graphqlEndpoint) ||
+        (requestedUrl.endsWith(config.graphqlEndpoint) ||
+          requestedUrl.endsWith(`${config.graphqlEndpoint}/`) ||
           url.pathname === config.graphqlEndpoint ||
           getUrlPattern(fetchAPI).test(url))
       ) {
diff --git a/packages/graphql-yoga/src/plugins/use-unhandled-route.ts b/packages/graphql-yoga/src/plugins/use-unhandled-route.ts
index aa499aea22..89a074f0f4 100644
--- a/packages/graphql-yoga/src/plugins/use-unhandled-route.ts
+++ b/packages/graphql-yoga/src/plugins/use-unhandled-route.ts
@@ -15,8 +15,10 @@ export function useUnhandledRoute(args: {
   }
   return {
     onRequest({ request, fetchAPI, endResponse, url }) {
+      const requestedUrl = request.url.split('?')[0];
       if (
-        !request.url.endsWith(args.graphqlEndpoint) &&
+        !requestedUrl.endsWith(args.graphqlEndpoint) &&
+        !requestedUrl.endsWith(`${args.graphqlEndpoint}/`) &&
         url.pathname !== args.graphqlEndpoint &&
         !getUrlPattern(fetchAPI).test(url)
       ) {