PyCu发布帖子时的怪异行为

Question

我有一个简单的代码将数据发送到远程服务器：

def main():
    headers = {}
    headers['Content-Type'] = 'application/json'

    target_url = r'the_url'

    data = {"bodyTextPlain": "O estimulante concorrente dos azulzinhos\r\nConhe\u00e7a a nova tend\u00eancia em estimulante masculino e feminino\r\n\r\nEste estimulante ficou conhecido por seus efeitos similares as p\u00edlulas\r\nazuis,\r\ndestacando-se por n\u00e3o possuir contraindica\u00e7\u00e3o ou efeito colateral.\r\n\r\nSucesso de vendas e principal concorrente natural dos azulzinhos,\r\nsua f\u00f3rmula \u00e9 totalmente natural e livre de qu\u00edmicos.\r\n\r\nPossuindo registro no Minist\u00e9rio da Sa\u00fade (ANVISA) e atestado de\r\nautenticidade.\r\n\r\nSaiba mais http://www5.somenteagora.com.br/maca\r\nAdquirindo 3 frascos voc\u00ea ganha +1 de brinde. Somente esta semana!\r\n\r\n\r\n\r\n\r\nPare de receber\r\nhttp://www5.somenteagora.com.br/app/sair/3056321/1\r\n\r\n"}

    buffer = StringIO()
    curl = pycurl.Curl()
    curl.setopt(curl.URL, target_url)
    curl.setopt(pycurl.HTTPHEADER, ['%s: %s' % (k, v) for k, v in headers.items()])

    # this line causes the problem
    curl.setopt(curl.POSTFIELDS, json.dumps(data))

    curl.setopt(pycurl.SSL_VERIFYPEER, False)
    curl.setopt(pycurl.SSL_VERIFYHOST, False)
    curl.setopt(pycurl.WRITEFUNCTION, buffer.write)
    curl.perform()

    response = buffer.getvalue()

    print curl.getinfo(pycurl.HTTP_CODE)
    print response

远程服务器在分析我发送的json字符串时出错：

500 { "status" : "Error", "message" : "Unexpected IOException (of type java.io.CharConversionException): Invalid UTF-32 character 0x3081a901(above 10ffff) at char #7, byte #31)" }

但是如果我从json.dumps文件然后执行post操作：

^{pr2}$

那么就没有错误了：

200

这两种情况有什么区别吗？在

谢谢。在

Answer 1

这是一个非常微妙的问题。答案在于documentation for ^{}中的警告：

Warning: No checking is performed that option does, in fact, expect a string value. Using this method incorrectly can crash the program and may lead to a security vulnerability. Furthermore, it is on the application to ensure that the value object does not get garbage collected while libcurl is using it. libcurl copies most string options but not all; one option whose value is not copied by libcurl is CURLOPT_POSTFIELDS.

使用变量时，这会创建对字符串的引用，这样就不会对其进行垃圾回收。当内联表达式时，在libcurl使用完该字符串之前释放该字符串，结果不可预测。在

为了避免担心对象的生存期，可以改用^{}。在