diff --git a/api/__init__.py b/api/__init__.py
index d3aa3c9..2d98b92 100644
--- a/api/__init__.py
+++ b/api/__init__.py
@@ -1,11 +1,10 @@
-#api/__init__.py
 import base64
 import os
 from functools import wraps
 
 from cryptography import x509
 from cryptography.hazmat.primitives import serialization
-from flask import jsonify, Blueprint, request
+from flask import jsonify, Blueprint, request, make_response
 from flask_limiter import Limiter
 from flask_limiter.util import get_remote_address
 from jwt import decode, ExpiredSignatureError, InvalidTokenError, get_unverified_header
@@ -14,6 +13,11 @@ import requests
 from threading import Lock
 
 import env_provider
+import hashlib
+import json
+
+
+
 
 _public_key_cache = {}
 _lock = Lock()
@@ -135,3 +139,24 @@ def register_blueprints(app):
                 app.register_blueprint(bp)
 
 
+
+def generate_etag(data):
+    serialized = json.dumps(data, sort_keys=True).encode('utf-8')
+    return hashlib.md5(serialized).hexdigest()
+
+def etag_response(f):
+    @wraps(f)
+    def decorator(*args, **kwargs):
+        response = f(*args, **kwargs)
+        if response[1] in (200, 201):
+            if isinstance(response[0], (dict, list)):
+                etag = generate_etag(response[0])
+                if_none_match = request.headers.get("if_none_match")
+                if if_none_match == etag:
+                    return jsonify({}), 200
+                resp = make_response(response[0], response[1])
+                resp.headers["ETag"] = etag
+                return resp
+        return response
+    return decorator
+
diff --git a/api/config.py b/api/config.py
index 7b57f59..5e4bafb 100644
--- a/api/config.py
+++ b/api/config.py
@@ -1,6 +1,6 @@
 from flask import Blueprint, jsonify, request
 
-from api import require_auth, rate_limits
+from api import require_auth, rate_limits, etag_response
 import re
 config_bp = Blueprint('config', __name__, url_prefix='/api/config')
 
@@ -10,6 +10,7 @@ def is_valid_rate_limit(limit):
     return bool(RATE_LIMIT_REGEX.match(limit))
 @config_bp.route('/limits', methods=['GET'])
 @require_auth(roles=['admin'])
+@etag_response
 def limits():
     return jsonify(rate_limits), 200
 
diff --git a/api/markdown.py b/api/markdown.py
index 7bf0451..8c09562 100644
--- a/api/markdown.py
+++ b/api/markdown.py
@@ -2,7 +2,7 @@
 from flask import Blueprint, request, jsonify
 
 import api
-from api import require_auth
+from api import require_auth, etag_response
 from contexts.RequestContext import RequestContext
 from db import get_db
 from db.models.Markdown import Markdown
@@ -14,6 +14,7 @@ markdown_bp = Blueprint('markdown', __name__, url_prefix='/api/markdown')
 
 @markdown_bp.route('/', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+@etag_response
 def get_markdowns():
     with get_db() as session:
         mds = session.query(Markdown).all()
@@ -21,12 +22,14 @@ def get_markdowns():
 
 @markdown_bp.route('/by_path/<int:path_id>', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+@etag_response
 def get_markdowns_by_path(path_id):
     with get_db() as session:
         markdowns = session.query(Markdown).filter(Markdown.path_id == path_id).all()
         return jsonify([md.to_dict() for md in markdowns]), 200
 @markdown_bp.route('/get_index/<int:path_id>', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+@etag_response
 def get_index(path_id):
     with get_db() as session:
         markdown = session.query(Markdown).filter(Markdown.path_id == path_id).filter(Markdown.title == "index").first()
@@ -38,6 +41,7 @@ def get_index(path_id):
 
 @markdown_bp.route('/<int:markdown_id>', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+@etag_response
 def get_markdown(markdown_id):
     with get_db() as session:
         markdown = session.query(Markdown).get(markdown_id)
diff --git a/api/path.py b/api/path.py
index 394d4b9..67385b8 100644
--- a/api/path.py
+++ b/api/path.py
@@ -1,7 +1,7 @@
 from flask import Blueprint, request, jsonify
 
 import api
-from api import require_auth
+from api import require_auth, etag_response
 from db import get_db
 from db.models.Markdown import Markdown
 from db.models.Path import Path
@@ -13,6 +13,7 @@ path_bp = Blueprint('path', __name__, url_prefix='/api/path')
 
 @path_bp.route('/', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+@etag_response
 def get_root_paths():
     with get_db() as session:
         paths = session.query(Path).filter(Path.parent_id == 1)
@@ -20,6 +21,7 @@ def get_root_paths():
 
 @path_bp.route('/<int:path_id>', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+@etag_response
 def get_path(path_id):
     with get_db() as session:
         path = session.query(Path).get(path_id)
@@ -29,6 +31,7 @@ def get_path(path_id):
 
 @path_bp.route('/parent/<int:parent_id>', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+@etag_response
 def get_path_by_parent(parent_id):
     with get_db() as session:
         paths = session.query(Path).filter(Path.parent_id == parent_id).all()
diff --git a/api/resource.py b/api/resource.py
index b161a2c..6b5d0d7 100644
--- a/api/resource.py
+++ b/api/resource.py
@@ -4,12 +4,13 @@ from flask import Blueprint, jsonify, request
 from contexts.RequestContext import RequestContext
 from db import get_db
 from db.models.Resource import Resource
-from api import require_auth, limiter
+from api import require_auth, limiter, etag_response
 import logging
 resource_bp = Blueprint('resource', __name__, url_prefix='/api/resource')
 logger = logging.getLogger(__name__)
 @resource_bp.route('/<identifier>', methods=['GET'])
 @limiter.limit(api.get_rate_limit)
+
 def get_resource(identifier):
     with get_db() as session:
         resource = session.query(Resource).get(identifier)