old_contents: # Usage: mitmdump -s "modify_response_body.py mitmproxy bananas"
  # (works best with --anticache)
  
  import sys
  from libmproxy.protocol.http import decoded
  
  
  def start(ctx, argv):
      if len(argv) != 3:
          sys.exit('Usage: -s "modify-response-body.py old new"')
      global old, new  # In larger scripts, a centralized options object (as returned by argparse) is encouraged
      old, new = argv[1:]
  
  
  def response(ctx, flow):
      with decoded(flow.response):  # automatically decode gzipped responses.
          flow.response.content = flow.response.content.replace(old, new)
new_contents: # Usage: mitmdump -s "modify_response_body.py mitmproxy bananas"
  # (works best with --anticache)
  
  import sys
  from libmproxy.protocol.http import decoded
  
  
  def start(ctx, argv):
      if len(argv) != 3:
          sys.exit('Usage: -s "modify-response-body.py old new"')
      ctx.old, ctx.new = argv[1], argv[2]
  
  
  def response(ctx, flow):
      with decoded(flow.response):  # automatically decode gzipped responses.
          flow.response.content = flow.response.content.replace(ctx.old, ctx.new)
subject: improve example scripts