python - pip install package from requirements 失败，“使用不安全的传输方案”

Question

我正在尝试通过 requirements.txt 文件中的条目安装django-forms-builder 。跑步时

pip install -r requirements.txt

我收到错误

django-forms-builder/0.11.1 uses an insecure transport scheme (http). Consider using https if  has it available
django-forms-builder/ uses an insecure transport scheme (http). Consider using https if  has it available
Could not find any downloads that satisfy the requirement django-forms-builder==0.11.1 (from -r requirements.txt (line 33))

消息很清楚，它想要https，但无论如何我都需要安装包。当我在需求文件之外单独安装它时，它可以使用一个简单的

pip install django-forms-builder

那么我怎样才能强制要求也接受它呢？