我遇到了一个奇怪的问题，Python post请求挂起，而cURL post请求工作正常。我向NIH Reporter API发出请求。
下面是一直挂着的Python代码：

headers = {
    "accept": "application/json",
    "Content-Type": "application/json"
}
data = {
    "criteria": {
        "award_notice_date": {
            "from_date": "2022-06-22",
        }
    },
    "include_fields": [
        "ProjectNum",
        "ProjectTitle",
        "AbstractText",
        "AwardNoticeDate"
    ],
    "offset": 14500,
    "limit": 500,
    "sort_field": "award_notice_date"
}

response = requests.post('https://api.reporter.nih.gov/v2/projects/search', headers=headers, data=str(data))

下面是cURL的等效代码：

curl -X POST "https://api.reporter.nih.gov/v2/projects/search" -H "accept: application/json" -H "Content-Type: application/json" -d "{'criteria': {'award_notice_date': {'from_date': '2022-06-22'}}, 'include_fields': ['ProjectNum', 'ProjectTitle', 'AbstractText', 'AwardNoticeDate'], 'offset': 14500, 'limit': 500, 'sort_field': 'award_notice_date'}"

我不确定我是否遗漏了什么。我也在使用Python3，而且我的Requests库是最新的2.27.1版本。