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为什么Python请求在循环中发出POST时返回相同的数据,即使在关闭会话之后也是如此?

python-requests http python-2.7

PhD Gangstead · 技术社区 · 8 年前

我在用Python Requests 但需要向SOAP API端点发出请求/发布。然而,尽管我在循环中重新生成了一个新的请求,我仍然会对多个请求接收相同的响应。我尝试过结束会议/回复,但没有效果。

手动发出请求会返回不同的数据。我会错过什么?

下面是代码示例:

quoteVariables = """
<QuoteVariables>
 {0}
</QuoteVariables>"""

for state, zipcode in states.iteritems():
    for key, value in buckets.iteritems():

        quotesXMLWithStateZip = buildQuote() #returns long xml string
        quotes = quoteVariables.format(quotesXMLWithStateZip)
        soapRequest=soapXML.format(state, quotes, value)

        headers = {'content-Type':'text/xml;charset=UTF-8', 'SOAPAction':'http://my.url.com', 'Connection':'close'} 

        with requests.Session() as s:
            response = s.post('https://my.url.com/endpoint', headers=headers, data=soapRequest, stream=False)

            if response.status_code == 200:
                xml = xmltodict.parse(response.text)

                #fetch relevant part of xml resposne, ignore soap headers etc.,

            else:
                print "Failure! Status: "+response.status_code+" Reason: "+response.reason

            response.close()
            s.close()

        #reset xml stuff to prevent stale data from lying around owing to string sharing/copying
        quotesXMLWithStateZip = ""
        quotes = ""
        soapRequest = ""

1 回复 | 直到 8 年前

PhD Gangstead 8 年前

令人惊讶的是,将此代码移动到一个单独的班似乎解决了这个问题——我的猜测是,全局/状态似乎摆脱了python请求模块(我可能错了)。

另外,搬到一个班级 with 块成为可选的,也就是说,它是否存在似乎并不重要-代码在有/没有它的情况下按预期工作。

例如:

responses = {}
for state, zipcode in states.iteritems():
    for key, value in buckets.iteritems():
        fetcher = MyFetcher()
        responses[state] = fetcher.getQuotes(state, zipcode, key, value)
print responses

密码 MyFetcher 看起来像:

class MyFetcher:
    def getQuotes(self, state, zipcode, key, value):
        quotesXMLWithStateZip = self.buildQuote() #returns long xml string
        quotes = self.quoteVariables.format(quotesXMLWithStateZip)
        soapRequest=self.soapXML.format(state, quotes, value)

        headers = {'content-Type':'text/xml;charset=UTF-8', 'SOAPAction':'http://my.url.com', 'Connection':'close'} 

        with requests.Session() as s: # <- ENTIRELY OPTIONAL
            response = s.post('https://my.url.com/endpoint', headers=headers, data=soapRequest, stream=False)

            if response.status_code == 200:
                xml = xmltodict.parse(response.text)

                #fetch relevant part of xml resposne, ignore soap headers etc.,

                return parsedResponse

            else:
                print "Failure! Status: "+response.status_code+" Reason: "+response.reason
                return None

            response.close() # <- NOT NEEDED
            s.close()        # <- NOT NEEDED

我只能猜测globals在构建/发送请求和/或接收响应时会以某种方式引发问题。