#1836 delay zlib import until needed

git-svn-id: https://xpra.org/svn/Xpra/trunk@19273 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/net/websocket.py

@@ -4,7 +4,6 @@
 # later version. See the file COPYING for details.
 
 import os
-import zlib
 import posixpath
 try:
     from urllib import unquote          #python2 @UnusedImport
@@ -231,6 +230,7 @@ def send_head(self):
                 assert len(content)==content_length, "expected %s to contain %i bytes but read %i bytes" % (path, content_length, len(content))
                 if content_length>128 and ("gzip" in accept) and (ext not in (".png", )):
                     #gzip it on the fly:
+                    import zlib
                     assert len(content)==content_length, "expected %s to contain %i bytes but read %i bytes" % (path, content_length, len(content))
                     gzip_compress = zlib.compressobj(9, zlib.DEFLATED, zlib.MAX_WBITS | 16)
                     compressed_content = gzip_compress.compress(content) + gzip_compress.flush()