Flutter/Dart中的SOAP请求 [英] SOAP Request in Flutter/Dart

问题描述

我需要使用Flutter向.NET Web服务(WSDL)发出SOAP请求.

I need to make a SOAP request to a .NET Webservice (WSDL) with Flutter.

此网络服务具有基本的身份验证(用户，密码)和一些带有预定义信封的服务.

This webservice has an basic auth (user, password) and some services with pre-defined envelopes.

所以我试图创建一个SOAP信封:

So I tried to create a SOAP envelope:

String requestBody = "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:tot=\"http://www.totvs.com/\">   <soapenv:Header/>   <soapenv:Body>      <tot:RealizarConsultaSQL>         <!--Optional:-->         <tot:codSentenca>ETHOS.TESTE</tot:codSentenca>         <!--Optional:-->         <tot:codColigada>0</tot:codColigada>         <!--Optional:-->         <tot:codSistema>F</tot:codSistema>         <!--Optional:-->         <tot:parameters></tot:parameters>      </tot:RealizarConsultaSQL>   </soapenv:Body></soapenv:Envelope>";

此信封有效.第二步是建立http连接:

This envelope is valid. The second step was to make a http connection:

http.Response response = await http.post(
  request,
  headers: {
    "Accept-Encoding": "gzip,deflate",
    "Content-Length": utf8.encode(requestBody).length.toString(),
    "Content-Type": "text/xmlc",
    "SOAPAction": "http://www.totvs.com/IwsConsultaSQL/RealizarConsultaSQL",
    "Authorization": "Basic bWVzdHJlOnRvdHZz",
    "Host": "totvs.brazilsouth.cloudapp.azure.com:8051",
    "Connection": "Keep-Alive",
    "User-Agent": "Apache-HttpClient/4.1.1 (java 1.5)"
  },
  body: utf8.encode(requestBody),
  encoding: Encoding.getByName("UTF-8")).then((onValue)
{
  print("Response status: ${onValue.statusCode}");
  print("Response body: ${onValue.body}");
 });

这时我只收到411代码:

At this point I just receive 411 code:

<hr><p>HTTP Error 411. The request must be chunked or have a content length.</p>

所以，我有两个大疑问:

So, I have 2 big doubts :

1. 如何通过身份验证(用户名/密码)；
2. 为什么即使硬编码设置"Content-Length"也总是返回411.

我是Dart/Flutter的新手

I'm new in Dart/Flutter

推荐答案

花费大量时间进行测试后，使用此标头获得了成功:

After a lot of hours spended in tests, I got success by using this header:

     "SOAPAction": "http://www.totvs.com/IwsConsultaSQL/RealizarConsultaSQL",
    "Content-Type": "text/xml;charset=UTF-8",
    "Authorization": "Basic bWVzdHJlOnRvdHZz",
    "cache-control": "no-cache"

它表明Content-Length是自动发送的，因此，起作用的代码是这样的:

It seams that Content-Length is send automatically, so, the code that worked is this:

  http.Response response = await http.post(
      request,
      headers: {
        "SOAPAction": "http://www.totvs.com/IwsConsultaSQL/RealizarConsultaSQL",
        "Content-Type": "text/xml;charset=UTF-8",
        "Authorization": "Basic bWVzdHJlOnRvdHZz",
        "cache-control": "no-cache"
      },
      body: utf8.encode(requestBody),
      encoding: Encoding.getByName("UTF-8")
  ).then((onValue)
  {
    print("Response status: ${onValue.statusCode}");
    print("Response body: ${onValue.body}");

  });

谢谢大家的帮助，我通过邮递员的代码获得了解决方案，就像以前建议的那样，谢谢.

Thanks all for the help, I got the solution by a Postman code, as suggested before, thanks.

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