Use "platformio.public.fetch_http_content" API for HTTP requests

platform.py

@@ -17,7 +17,6 @@
 import sys
 import json
 import re
-import requests
 
 from platformio.public import PlatformBase, to_unix_path
 
@@ -349,16 +348,15 @@ def _prepare_url_for_index_file(url_items):
  )
 
  index_file_url = _prepare_url_for_index_file(url_items)
- r = requests.get(index_file_url, timeout=10)
- if r.status_code != 200:
- raise ValueError(
- (
- "Failed to download package index file due to a bad response (%d) "
- "from the remote `%s`"
- )
- % (r.status_code, index_file_url)
- )
- return r.json()
+
+ try:
+ from platformio.public import fetch_http_content
+ content = fetch_http_content(index_file_url)
+ except ImportError:
+ import requests
+ content = requests.get(index_file_url, timeout=5).text
+
+ return json.loads(content)
 
  def configure_arduino_toolchains(self, package_index):
  if not package_index: