import re from django.utils.text import compress_string from django.utils.cache import patch_vary_headers re_accepts_gzip = re.compile(r'\bgzip\b') class GZipMiddleware(object): """ This middleware compresses content if the browser allows gzip compression. It sets the Vary header accordingly, so that caches will base their storage on the Accept-Encoding header. """ def process_response(self, request, response): # It's not worth compressing non-OK or really short responses. if response.status_code != 200 or len(response.content) < 200: return response patch_vary_headers(response, ('Accept-Encoding',)) # Avoid gzipping if we've already got a content-encoding. if response.has_header('Content-Encoding'): return response # Older versions of IE have issues with gzipped pages containing either # Javascript and PDF. if "msie" in request.META.get('HTTP_USER_AGENT', '').lower(): ctype = response.get('Content-Type', '').lower() if "javascript" in ctype or ctype == "application/pdf": return response ae = request.META.get('HTTP_ACCEPT_ENCODING', '') if not re_accepts_gzip.search(ae): return response response.content = compress_string(response.content) response['Content-Encoding'] = 'gzip' response['Content-Length'] = str(len(response.content)) return response