diff --git a/packages/libraries/laboratory/src/components/laboratory/laboratory.tsx b/packages/libraries/laboratory/src/components/laboratory/laboratory.tsx
index 44c887be38..0f6dd1ad6d 100644
--- a/packages/libraries/laboratory/src/components/laboratory/laboratory.tsx
+++ b/packages/libraries/laboratory/src/components/laboratory/laboratory.tsx
@@ -514,15 +514,10 @@ export const Laboratory = (
   const pluginsApi = usePlugins(props);
   const testsApi = useTests(props);
   const tabsApi = useTabs(props);
-  const endpointApi = useEndpoint({
-    ...props,
-    settingsApi,
-  });
   const collectionsApi = useCollections({
     ...props,
     tabsApi,
   });
-
   const operationsApi = useOperations({
     ...props,
     collectionsApi,
@@ -533,6 +528,13 @@ export const Laboratory = (
     pluginsApi,
     checkPermissions,
   });
+  const endpointApi = useEndpoint({
+    ...props,
+    settingsApi,
+    operationsApi,
+    envApi,
+    pluginsApi,
+  });
 
   const historyApi = useHistory(props);
 
diff --git a/packages/libraries/laboratory/src/lib/endpoint.ts b/packages/libraries/laboratory/src/lib/endpoint.ts
index 55848cd9e3..f9ff88c7f0 100644
--- a/packages/libraries/laboratory/src/lib/endpoint.ts
+++ b/packages/libraries/laboratory/src/lib/endpoint.ts
@@ -1,12 +1,16 @@
-import { useCallback, useEffect, useMemo, useState } from 'react';
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import {
   buildClientSchema,
   GraphQLSchema,
   introspectionFromSchema,
   type IntrospectionQuery,
 } from 'graphql';
+import { debounce } from 'lodash';
 import { toast } from 'sonner';
-// import z from 'zod';
+import { LaboratoryEnv, LaboratoryEnvActions, LaboratoryEnvState } from '@/lib/env';
+import { LaboratoryOperationsActions, LaboratoryOperationsState } from '@/lib/operations';
+import { handleTemplate } from '@/lib/operations.utils';
+import { LaboratoryPluginsActions, LaboratoryPluginsState } from '@/lib/plugins';
 import { asyncInterval } from '@/lib/utils';
 import { SubscriptionProtocol, UrlLoader } from '@graphql-tools/url-loader';
 import type { LaboratorySettingsActions, LaboratorySettingsState } from './settings';
@@ -24,11 +28,16 @@ export interface LaboratoryEndpointActions {
   restoreDefaultEndpoint: () => void;
 }
 
+export const EXPECTED_ERROR_REASON = 'Expected error reason';
+
 export const useEndpoint = (props: {
   defaultEndpoint?: string | null;
   onEndpointChange?: (endpoint: string | null) => void;
   defaultSchemaIntrospection?: IntrospectionQuery | null;
   settingsApi?: LaboratorySettingsState & LaboratorySettingsActions;
+  operationsApi?: LaboratoryOperationsState & LaboratoryOperationsActions;
+  envApi?: LaboratoryEnvState & LaboratoryEnvActions;
+  pluginsApi?: LaboratoryPluginsState & LaboratoryPluginsActions;
 }): LaboratoryEndpointState & LaboratoryEndpointActions => {
   const [endpoint, _setEndpoint] = useState<string | null>(props.defaultEndpoint ?? null);
   const [introspection, setIntrospection] = useState<IntrospectionQuery | null>(null);
@@ -47,67 +56,109 @@ export const useEndpoint = (props: {
 
   const loader = useMemo(() => new UrlLoader(), []);
 
-  const fetchSchema = useCallback(
-    async (signal?: AbortSignal) => {
-      if (endpoint === props.defaultEndpoint && props.defaultSchemaIntrospection) {
-        setIntrospection(props.defaultSchemaIntrospection);
-        return;
-      }
-
-      if (!endpoint) {
-        setIntrospection(null);
-        return;
-      }
-
-      try {
-        const result = await loader.load(endpoint, {
-          subscriptionsEndpoint: endpoint,
-          subscriptionsProtocol:
-            (props.settingsApi?.settings.subscriptions.protocol as SubscriptionProtocol) ??
-            SubscriptionProtocol.GRAPHQL_SSE,
-          credentials: props.settingsApi?.settings.fetch.credentials,
-          specifiedByUrl: true,
-          directiveIsRepeatable: true,
-          inputValueDeprecation: true,
-          retry: props.settingsApi?.settings.fetch.retry,
-          timeout: props.settingsApi?.settings.fetch.timeout,
-          useGETForQueries: props.settingsApi?.settings.fetch.useGETForQueries,
-          exposeHTTPDetailsInExtensions: true,
-          descriptions: props.settingsApi?.settings.introspection.schemaDescription ?? false,
-          method: props.settingsApi?.settings.introspection.method ?? 'POST',
-          fetch: (input: string | URL | Request, init?: RequestInit) =>
-            fetch(input, {
-              ...init,
-              signal,
-            }),
-        });
-
-        if (result.length === 0) {
-          throw new Error('Failed to fetch schema');
-        }
-
-        if (!result[0].schema) {
-          throw new Error('Failed to fetch schema');
-        }
-
-        setIntrospection(introspectionFromSchema(result[0].schema));
-      } catch (error: unknown) {
-        if (
-          error &&
-          typeof error === 'object' &&
-          'message' in error &&
-          typeof error.message === 'string'
-        ) {
-          toast.error(error.message);
-        } else {
-          toast.error('Failed to fetch schema');
-        }
-
-        setIntrospection(null);
-
-        throw error;
-      }
-    },
+  const activeOperationHeadersRef = useRef<string | null | undefined>(
+    props.operationsApi?.activeOperation?.headers,
+  );
+  const envVariablesRef = useRef<LaboratoryEnv['variables'] | undefined>(
+    props.envApi?.env?.variables,
+  );
+  const pluginsStateRef = useRef<Record<string, any> | undefined>(props.pluginsApi?.pluginsState);
+
+  activeOperationHeadersRef.current = props.operationsApi?.activeOperation?.headers;
+  envVariablesRef.current = props.envApi?.env?.variables;
+  pluginsStateRef.current = props.pluginsApi?.pluginsState;
+
+  const fetchSchema = useMemo(
+    () =>
+      debounce(
+        async (
+          signal?: AbortSignal,
+          options?: {
+            env?: LaboratoryEnv;
+            pluginsState?: Record<string, any>;
+          },
+        ) => {
+          if (endpoint === props.defaultEndpoint && props.defaultSchemaIntrospection) {
+            setIntrospection(props.defaultSchemaIntrospection);
+            return;
+          }
+
+          if (!endpoint) {
+            setIntrospection(null);
+            return;
+          }
+
+          try {
+            let parsedHeaders: Record<string, string> = {};
+
+            try {
+              parsedHeaders = activeOperationHeadersRef.current
+                ? JSON.parse(
+                    handleTemplate(activeOperationHeadersRef.current, {
+                      ...(options?.env?.variables ?? envVariablesRef.current ?? {}),
+                      plugins: options?.pluginsState ?? pluginsStateRef.current ?? {},
+                    }),
+                  )
+                : {};
+            } catch (error: unknown) {
+              toast.error('Failed to parse headers');
+            }
+
+            const result = await loader.load(endpoint, {
+              subscriptionsEndpoint: endpoint,
+              subscriptionsProtocol:
+                (props.settingsApi?.settings.subscriptions.protocol as SubscriptionProtocol) ??
+                SubscriptionProtocol.GRAPHQL_SSE,
+              headers: parsedHeaders,
+              credentials: props.settingsApi?.settings.fetch.credentials,
+              specifiedByUrl: true,
+              directiveIsRepeatable: true,
+              inputValueDeprecation: true,
+              retry: props.settingsApi?.settings.fetch.retry,
+              timeout: props.settingsApi?.settings.fetch.timeout,
+              useGETForQueries: props.settingsApi?.settings.fetch.useGETForQueries,
+              exposeHTTPDetailsInExtensions: true,
+              descriptions: props.settingsApi?.settings.introspection.schemaDescription ?? false,
+              method: props.settingsApi?.settings.introspection.method ?? 'POST',
+              fetch: (input: string | URL | Request, init?: RequestInit) =>
+                fetch(input, {
+                  ...init,
+                  signal,
+                }),
+            });
+
+            if (result.length === 0) {
+              throw new Error('Failed to fetch schema');
+            }
+
+            if (!result[0].schema) {
+              throw new Error('Failed to fetch schema');
+            }
+
+            setIntrospection(introspectionFromSchema(result[0].schema));
+          } catch (error: unknown) {
+            if (
+              error &&
+              typeof error === 'object' &&
+              'message' in error &&
+              typeof error.message === 'string'
+            ) {
+              if (error.message === EXPECTED_ERROR_REASON) {
+                return;
+              }
+
+              toast.error(error.message);
+            } else {
+              toast.error('Failed to fetch schema');
+            }
+
+            setIntrospection(null);
+
+            throw error;
+          }
+        },
+        500,
+      ),
     [
       endpoint,
       props.settingsApi?.settings.fetch.timeout,
@@ -116,6 +167,12 @@ export const useEndpoint = (props: {
     ],
   );
 
+  useEffect(() => {
+    return () => {
+      fetchSchema.cancel();
+    };
+  }, [fetchSchema]);
+
   const shouldPollSchema = useMemo(() => {
     return endpoint !== props.defaultEndpoint || !props.defaultSchemaIntrospection;
   }, [endpoint, props.defaultEndpoint, props.defaultSchemaIntrospection]);
@@ -132,7 +189,7 @@ export const useEndpoint = (props: {
         try {
           await fetchSchema(intervalController.signal);
         } catch {
-          intervalController.abort('Polling schema failed');
+          intervalController.abort(new Error('Aborted because of schema polling error'));
         }
       },
       5000,
@@ -140,7 +197,7 @@ export const useEndpoint = (props: {
     );
 
     return () => {
-      intervalController.abort('Polling schema aborted');
+      intervalController.abort(new Error(EXPECTED_ERROR_REASON));
     };
   }, [shouldPollSchema, fetchSchema]);
 
@@ -152,10 +209,39 @@ export const useEndpoint = (props: {
 
   useEffect(() => {
     if (endpoint && !shouldPollSchema) {
-      void fetchSchema();
+      const abortController = new AbortController();
+
+      void fetchSchema(abortController.signal);
+
+      return () => {
+        abortController.abort(new Error(EXPECTED_ERROR_REASON));
+      };
     }
   }, [endpoint, fetchSchema, shouldPollSchema]);
 
+  useEffect(() => {
+    if (!endpoint || !shouldPollSchema) {
+      return;
+    }
+
+    const abortController = new AbortController();
+    void fetchSchema(abortController.signal, {
+      env: props.envApi?.env ?? undefined,
+      pluginsState: props.pluginsApi?.pluginsState,
+    });
+
+    return () => {
+      abortController.abort(new Error(EXPECTED_ERROR_REASON));
+    };
+  }, [
+    endpoint,
+    shouldPollSchema,
+    fetchSchema,
+    props.operationsApi?.activeOperation?.headers,
+    props.envApi?.env?.variables,
+    props.pluginsApi?.pluginsState,
+  ]);
+
   return {
     endpoint,
     setEndpoint,