old_contents: from flask import Flask, request
  import requests
  from urllib import unquote
  
  app = Flask(__name__)
  
  @app.route("/")
  def meme():
      domain = request.args["team_domain"]
      slackbot = request.args["slackbot"]
      text = request.args["text"]
      channel = request.args["channel_name"]
  
      text = text[:-1] if text[-1] == ";" else text
      params = text.split(";")
      params = [x.strip().replace(" ", "-") for x in params]
      params = [unquote(x) for x in params]
  
      if not len(params) == 3:
          response = "Your syntax should be in the form: /meme template; top; bottom;"
      else:
          template = params[0]
          top = params[1]
          bottom = params[2]
  
          response = "http://memegen.link/{0}/{1}/{2}.jpg".format(template, top, bottom)
  
      url = "https://{0}.slack.com/services/hooks/slackbot?token={1}&channel=%23{2}".format(domain, slackbot, channel)
      requests.post(url, data=response)
  
      return "ok", 200
new_contents: from flask import Flask, request
  import requests
  from urllib import unquote
  
  app = Flask(__name__)
  
  @app.route("/")
  def meme():
      domain = request.args["team_domain"]
      slackbot = request.args["slackbot"]
      text = request.args["text"]
      channel = request.args["channel_id"]
  
      text = unquote(text)
      text = text[:-1] if text[-1] == ";" else text
      params = text.split(";")
      params = [x.strip().replace(" ", "-") for x in params]
  
      if not len(params) == 3:
          response = "Your syntax should be in the form: /meme template; top; bottom;"
      else:
          template = params[0]
          top = params[1]
          bottom = params[2]
  
          response = "http://memegen.link/{0}/{1}/{2}.jpg".format(template, top, bottom)
  
      url = "https://{0}.slack.com/services/hooks/slackbot?token={1}&channel={2}".format(domain, slackbot, channel)
      requests.post(url, data=response)
  
      return "ok", 200
subject: Use the id of the channel and unquote all of the text first.