XML-RPC Python客户端引发xml.parsers.expat.ExpatError异常

Question

我正在尝试使用Python的xmlrpclib库进行XMP-RPC，但遇到了一些问题。

xml.parsers.expat.ExpatError: XML or text declaration not at start of entity: line 1, column 1

这是我用来传递参数的字典：

{'cliente_chave': 'hUi238sh328sjk37Hms8Kisjeg9',
     'cliente_codigo': 164,
     'imovel_bairro': u'Renascen\xe7a',
     'imovel_banheiros': u'5',
     'imovel_cidade': u'S\xe3o Lu\xeds - MA',
     'imovel_codigo_imobiliaria': u'757',
     'imovel_descricao': u'\n\t\t\t\n\t\t\tCasa em otima localiza\xe7\xe3o ideal tanto para empresas quanto para moradia tendo:\r\nTerra\xe7o\r\nSala Ampla para 03 ambientes\r\nLavabo\r\nHall\r\n03 su\xedtes\r\nEscritorio\r\nCozinha\r\nQuintaL\r\n\xc1rea de Servi\xe7o\r\nDCE\r\nGaragem coberta para 02 carros\r\nPort\xe3o eletronico\r\nCisterna\r\nNascente',
     'imovel_estado': 'MA',
     'imovel_negociacao': 'venda',
     'imovel_novo': False,
     'imovel_quartos': u'3',
     'imovel_subtipo': u'padr\xe3o',
     'imovel_suites': u'3',
     'imovel_tipo': u'casa',
     'imovel_vagas': u'2',
     'imovel_valor': u' 480.000,00',
     'url': 'http://www.estiloma.com.br/imoveis/para-venda/em-sao-luis/no-bairro-renascenca/casa-padrao/id-774.html'}

这是出现异常时的错误追踪信息：

Traceback (most recent call last):
      File "/Library/Python/2.7/site-packages/Twisted-12.2.0-py2.7-macosx-10.8-intel.egg/twisted/internet/defer.py", line 551, in _runCallbacks
        current.result = callback(current.result, *args, **kw)
      File "/Users/bslima/Documents/Aptana Studio 3 Workspace/aqueleimovel/aqueleimovel/pipelines.py", line 31, in process_item
        result = server.salvar_imovel(dict(item))
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1224, in __call__
        return self.__send(self.__name, args)
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1575, in __request
        verbose=self.__verbose
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1264, in request
        return self.single_request(host, handler, request_body, verbose)
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1297, in single_request
        return self.parse_response(response)
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1467, in parse_response
        p.feed(data)
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 557, in feed
        self._parser.Parse(data, 0)
    xml.parsers.expat.ExpatError: XML or text declaration not at start of entity: line 1, column 1

我只使用UTF-8编码来处理字符串，尝试过对字符串进行编码或解码为UTF-8，但都没有成功。我也试着在网上搜索这个问题，但没有找到解决办法。有没有人遇到过类似的情况？

哦，这是我的客户端代码：

server = ServerProxy(uri=settings.RPC_SERVER, verbose=True)
server.salvar_imovel(item)

提前感谢大家的帮助。

正如我评论的那样，ExpatError出现在响应对象中。谢谢。

Answer 1

看起来你把一个 dict 对象传给了一个需要 XML 的地方——就是这一行

server.salvar_imovel(dict(item))

如果你真的需要传这个 dict，你可以先把它转换成字符串。这里有一些示例代码 在这里。

Answer 2

[已解决] 响应开头有空格的问题。 我需要从xmlrpc扩展Transport类，并简单地去掉响应中的空格。

from xmlrpc.client import SafeTransport, Transport
from xmlrpc.client import GzipDecodedResponse

is_https = False
if is_https:
    BaseTransport = SafeTransport
else:
    BaseTransport = Transport

class CustomTransport(BaseTransport):
    def parse_response(self, response):
        # read response data from httpresponse, and parse it

        # Check for new http response object, else it is a file object
        if hasattr(response,'getheader'):
            if response.getheader("Content-Encoding", "") == "gzip":
                stream = GzipDecodedResponse(response)
            else:
                stream = response
        else:
            stream = response

        p, u = self.getparser()

        while 1:
            data = stream.read(1024)
            data = data.strip()
            if not data:
                break
            if self.verbose:
                print "body:", repr(data)
            p.feed(data)

        if stream is not response:
            stream.close()
        p.close()

        return u.close()