Consistent request-response separators.

httpie/core.py

@@ -119,7 +119,12 @@ def get_output(args, env, request, response):
             with_body=OUT_RESP_BODY in args.output_options)
         )
 
-    return b''.join(exchange)
+    output = b'\n\n\n'.join(exchange)
+
+    if env.stdout_isatty:
+        output += b'\n\n'
+
+    return output
 
 
 def get_exist_status(code, allow_redirects=False):

httpie/output.py

@@ -79,9 +79,6 @@ def format(msg, prettifier=None, with_headers=True, with_body=True,
 
         chunks.append(body)
 
-        if env.stdout_isatty:
-            chunks.append(b'\n\n')
-
     return b''.join(chunks)
 
 
@@ -211,7 +208,6 @@ class OutputProcessor(object):
     ]
 
     def __init__(self, env, **kwargs):
-        self.env = env
         processors = [
             cls(env, **kwargs)
             for cls in self.installed_processors