Scrapy：FormRequest不自动填充ASP.net隐藏字段

Question

我正在使用Scrapy来抓取一些需要登录才能访问的内容。这个网站是用ASP.net做的，ASP里面有一些看不见的字段到处都是（比如__VIEWSTATE和__EVENTTARGET）。

当我调用FormRequest.from_response(response,...的时候，我本以为它会自动从响应中读取这些看不见的字段，并把它们填到formdata这个字典里——这也是Scrapy的FormRequest文档上说的应该做到的事情。

但是如果真是这样，那为什么登录过程只有在我明确列出这些字段并填充它们的时候才有效呢？

class ItsyBitsy(Spider):
    name = "itsybitsy"
    allowed_domains = ["website.com"]
    start_urls = ["http://website.com/cpanel/Default.aspx"]

    def parse(self, response):
        # Performs authentication to get past the login form
        sel = Selector(response)
        return [FormRequest.from_response(response,
        formdata={
        'tb_Username':'admin',
        'tb_Password':'password',

        # The following fields should be auto populated, right?
        # So why does removing 'em break the login (w/500 Server Error)
        '__VIEWSTATE':
              sel.xpath("//input[@name='__VIEWSTATE']/@value").extract(),
        '__EVENTVALIDATION':
              sel.xpath("//input[@name='__EVENTVALIDATION']/@value").extract(),
        '__EVENTTARGET': 'b_Login'

        },
        callback=self.after_login,
        clickdata={'id':'b_Login'},
        dont_click=True)]

    def after_login(self, response):
        # Mmm, scrumptious
        pass

编辑：添加表单HTML

<form id="form1" action="Default.aspx" method="post" name="form1">
<div>
<input type="hidden" value="" id="__EVENTTARGET" name="__EVENTTARGET">
<input type="hidden" value="" id="__EVENTARGUMENT" name="__EVENTARGUMENT">
<input type="hidden" value="/wEPDwULLTE2OTg2NjA1NTAPZBYCAgMPZBYGAgMPD2QWAh4Kb25rZXlwcmVzcwUlcmV0dXJuIGNsaWNrQnV0dG9uKGV2ZW50LCAnYl9Mb2dpbicpO2QCBQ8PZBYCHwAFJXJldHVybiBjbGlja0J1dHRvbihldmVudCwgJ2JfTG9naW4nKTtkAgcPD2QWAh4Hb25jbGljawUPcmV0dXJuIGxvZ2luKCk7ZGRKt/WTOQThVTxB9Y0QcIuRqylCIw==" id="__VIEWSTATE" name="__VIEWSTATE">
</div>

<script type="text/javascript">
//&lt;![CDATA[
var theForm = document.forms['form1'];
if (!theForm) {
theForm = document.form1;
}
function __doPostBack(eventTarget, eventArgument) {
if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
theForm.__EVENTTARGET.value = eventTarget;
theForm.__EVENTARGUMENT.value = eventArgument;
theForm.submit();
}
}
//]]&gt;
</script>


<div>

<input type="hidden" value="/wEWBAK0o8DDCQLxz5rcDwLF8dCIDALHyYWSA+rA4VJNaEpFIycMDHQPUOz393TI" id="__EVENTVALIDATION" name="__EVENTVALIDATION">
<input type="text" onkeypress="return clickButton(event, 'b_Login');" size="28" class="textfield-text" id="tb_Username" name="tb_Username">
<input type="password" onkeypress="return clickButton(event, 'b_Login');" size="28" class="textfield-text" id="tb_Password" name="tb_Password">
<a href="javascript:__doPostBack('b_Login','')" class="button-link" id="b_Login" onclick="return login();">Login</a>
</form>

网络爬虫 ASP.NET 隐藏字段 scrapy 表单提交响应处理登录认证 formrequest

Scrapy：FormRequest不自动填充ASP.net隐藏字段

编辑：添加表单HTML

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