old_contents: from flask import Blueprint, request
  
  from skier import pgp
  from skier.keyinfo import KeyInfo
  
  legacypks = Blueprint("pks", __name__)
  
  @legacypks.route("/add", methods=["POST"])
  def pksadd():
      keytext = request.form["keytext"]
      result = pgp.add_pgp_key(keytext)
      if result[0]:
          return "", 200, {"X-HKP-Results-Count": "1"}
      else:
          return "Key add failed", 400, {"X-HKP-Results-Count": "1"}
  
  @legacypks.route("/lookup", methods=["GET"])
  def pksgetkey():
      if 'op' in request.args and request.args.get("op") == "get":
          # Lookup the key
          keyid = request.args.get("search")
          if keyid is None or not keyid.startswith("0x"):
              return "Invalid key data", 401
          else:
              key = pgp.get_pgp_armor_key(keyid)
              if key: return key, 200, {"Cache-Control": "no-cache", "Pragma": "no-cache"}
              else: return "", 404
      elif 'op' in request.args and request.args.get("op") == "index":
          return pkssearch(request.args)
      else:
          return "Invalid request", 400
  
  def format_pks(keys):
      # First, add header.
      # This comes in the format of "info:1:{number-of-keys}"
      data = ""
      data += "info:1:{}\n".format(keys.total)
      # Then, add the strings for each key.
      for key in keys.query.all():
          # Load keyinfo.
          newkey = KeyInfo.pgp_dump(key.armored)
          s1, s2 = newkey.to_pks()
          data += s1 + '\n' + s2 + '\n'
      return data
  
  def pkssearch(rargs):
      keys = pgp.search_through_keys(rargs.get("search"))
      if not keys.total:
          return "No keys found", 404
      else:
          return format_pks(keys), 200, {"X-HKP-Results-Count": keys.total}
new_contents: from flask import Blueprint, request
  
  from skier import pgp
  from skier.keyinfo import KeyInfo
  
  legacypks = Blueprint("pks", __name__)
  
  @legacypks.route("/add", methods=["POST"])
  def pksadd():
      keytext = request.form["keytext"]
      result = pgp.add_pgp_key(keytext)
      if result[0]:
          return "", 200, {"X-HKP-Results-Count": "1"}
      else:
          return "Key add failed", 400, {"X-HKP-Results-Count": "1"}
  
  @legacypks.route("/lookup", methods=["GET"])
  def pksgetkey():
      if 'op' in request.args and request.args.get("op") == "get":
          # Lookup the key
          keyid = request.args.get("search")
          if keyid is None or not keyid.startswith("0x"):
              return "Invalid key data", 401
          else:
              key = pgp.get_pgp_armor_key(keyid)
              if key: return key, 200, {"Cache-Control": "no-cache", "Pragma": "no-cache", "Content-Type": "application/x-pgp-key"}
              else: return "", 404
      elif 'op' in request.args and request.args.get("op") == "index":
          return pkssearch(request.args)
      else:
          return "Invalid request", 400
  
  def format_pks(keys):
      # First, add header.
      # This comes in the format of "info:1:{number-of-keys}"
      data = ""
      data += "info:1:{}\n".format(keys.total)
      # Then, add the strings for each key.
      for key in keys.query.all():
          # Load keyinfo.
          newkey = KeyInfo.pgp_dump(key.armored)
          s1, s2 = newkey.to_pks()
          data += s1 + '\n' + s2 + '\n'
      return data
  
  def pkssearch(rargs):
      keys = pgp.search_through_keys(rargs.get("search"))
      if not keys.total:
          return "No keys found", 404
      else:
          return format_pks(keys), 200, {"X-HKP-Results-Count": keys.total, "Content-Type": "application/x-pgp-search"}
subject: Add custom Content-Type headers to PKS, to prevent them from being compressed.