diff --git a/bazarr/api.py b/bazarr/api.py
index fbe3de5ef..a6011524d 100644
--- a/bazarr/api.py
+++ b/bazarr/api.py
@@ -6,7 +6,7 @@ import datetime
 import pretty
 
 from get_args import args
-from config import settings
+from config import settings, base_url
 
 from init import *
 import logging
@@ -19,7 +19,7 @@ from flask import Flask, jsonify, request, Response, Blueprint
 
 from flask_restful import Resource, Api
 
-api_bp = Blueprint('api', __name__, url_prefix='/api')
+api_bp = Blueprint('api', __name__, url_prefix=base_url.rstrip('/')+'/api')
 api = Api(api_bp)
 
 
diff --git a/bazarr/main.py b/bazarr/main.py
index 5994d92de..4398d1c6c 100644
--- a/bazarr/main.py
+++ b/bazarr/main.py
@@ -44,7 +44,8 @@ from io import BytesIO
 from six import text_type, PY2
 from datetime import timedelta
 from get_languages import load_language_in_db, language_from_alpha3, language_from_alpha2, alpha2_from_alpha3
-from flask import Flask, make_response, request, redirect, abort, render_template, Response, session, flash, url_for, send_file
+from flask import Flask, make_response, request, redirect, abort, render_template, Response, session, flash, url_for, \
+    send_file, stream_with_context
 
 from get_providers import get_providers, get_providers_auth, list_throttled_providers
 from get_series import *
@@ -65,27 +66,23 @@ from flask_debugtoolbar import DebugToolbarExtension
 from functools import wraps
 
 
-class PrefixMiddleware(object):
-
-    def __init__(self, app, prefix=''):
-        self.app = app
-        self.prefix = prefix
-
-    def __call__(self, environ, start_response):
-
-        if environ['PATH_INFO'].startswith(self.prefix):
-            environ['PATH_INFO'] = environ['PATH_INFO'][len(self.prefix):]
-            environ['SCRIPT_NAME'] = self.prefix
-            return self.app(environ, start_response)
-        else:
-            start_response('404', [('Content-Type', 'text/plain')])
-            return ["This url does not belong to the app.".encode()]
+def prefix_route(route_function, prefix='', mask='{0}{1}'):
+    # Defines a new route function with a prefix.
+    # The mask argument is a `format string` formatted with, in that order: prefix, route
+    def newroute(route, *args, **kwargs):
+        # New function to prefix the route
+        return route_function(mask.format(prefix, route), *args, **kwargs)
+    return newroute
 
 # Flask Setup
 app = Flask(__name__,
             template_folder=os.path.join(os.path.dirname(__file__), '..', 'views'),
             static_folder=os.path.join(os.path.dirname(__file__), '..', 'static'))
-app.wsgi_app = PrefixMiddleware(app.wsgi_app, prefix=base_url)
+app.route = prefix_route(app.route, base_url.rstrip('/'))
+
+@app.errorhandler(404)
+def http_error_handler(error):
+    return redirect(base_url.rstrip('/')), 302
 
 app.config["SECRET_KEY"] = 'test'
 
@@ -511,17 +508,13 @@ def download_log():
 @login_required
 def image_proxy(url):
     apikey = settings.sonarr.apikey
-    url_image = url_sonarr_short() + '/' + url + '?apikey=' + apikey
+    url_image = (url_sonarr_short() + '/' + url + '?apikey=' + apikey).replace('poster-250', 'poster-500')
     try:
-        image_buffer = BytesIO(
-            requests.get(url_sonarr() + '/api' + url_image.split(url_sonarr())[1], timeout=15, verify=False).content)
+        req = requests.get(url_sonarr() + '/api' + url_image.split(url_sonarr())[1], stream=True, timeout=15, verify=False)
     except:
         return None
     else:
-        image_buffer.seek(0)
-        bytes = image_buffer.read()
-        request.set_header('Content-type', 'image/jpeg')
-        return bytes
+        return Response(stream_with_context(req.iter_content(2048)), content_type=req.headers['content-type'])
 
 
 @app.route('/image_proxy_movies/<path:url>', methods=['GET'])
@@ -530,17 +523,12 @@ def image_proxy_movies(url):
     apikey = settings.radarr.apikey
     try:
         url_image = (url_radarr_short() + '/' + url + '?apikey=' + apikey).replace('/fanart.jpg', '/banner.jpg')
-        image_buffer = BytesIO(
-            requests.get(url_radarr() + '/api' + url_image.split(url_radarr())[1], timeout=15, verify=False).content)
+        req = requests.get(url_radarr() + '/api' + url_image.split(url_radarr())[1], stream=True, timeout=15, verify=False)
     except:
         url_image = url_radarr_short() + '/' + url + '?apikey=' + apikey
-        image_buffer = BytesIO(
-            requests.get(url_radarr() + '/api' + url_image.split(url_radarr())[1], timeout=15, verify=False).content)
+        req = requests.get(url_radarr() + '/api' + url_image.split(url_radarr())[1], stream=True, timeout=15, verify=False)
     else:
-        image_buffer.seek(0)
-        bytes = image_buffer.read()
-        request.set_header('Content-type', 'image/jpeg')
-        return bytes
+        return Response(stream_with_context(req.iter_content(2048)), content_type=req.headers['content-type'])
 
 
 @app.route("/")