Question

我在WebAPI中使用CORS支持并从EntityManager获取一个奇怪的结果集，即使我从服务器获取状态代码200和数据。响应得到

错误消息是（截断）：

{message: "; ", statusText: "OK", status: 200, url:"http://localhost:61808/odata/Servers?$filter=Id%20gt%2080&$top=20&$expand=Owner%2CApplications"}

我的datacontext：

(function () {
  angular.module('App').factory('datacontext', datacontext);

  datacontext.$inject = ['EntityManagerFactory'];

  function datacontext(EntityManagerFactory) {
    var EntityQuery = breeze.EntityQuery;
    var Manager = EntityManagerFactory.newManager();

return {
  getServers: getServers
};

function getServers() {
  return EntityQuery
    .from('Servers')
    .expand('owner, applications')
    .where('id', 'gt', 80)
    .take(20)
    .toType('server')
    .using(Manager)
    .noTracking()
    .execute()
    .then(success)
    .catch(error);
}

function success(response) {
  return response.results;
}

function error(error) {
  console.log(error);
}

我的WebAPI web.config：

<httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="*" />
    <add name="Access-Control-Allow-Headers" value="Content-Type, DataServiceVersion, MaxDataServiceVersion" />
    <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS, MERGE" />
  </customHeaders>
</httpProtocol>

此代码在Internet Explorer中运行良好。但是，即使有效负载已交付，Chrome中也会出现错误！有什么想法吗？

Answer 1

当前版本的datajs 1.1.2中存在一个错误，该错误是根据https://datajs.codeplex.com/workitem/756上的codeplex问题提交的。

在datajs.js中，将readResponseHeaders替换为：

var readResponseHeaders = function (xhr, headers) {
  /// <summary>Reads response headers into array.</summary>
  /// <param name="xhr" type="XMLHttpRequest">HTTP request with response available.</param>
  /// <param name="headers" type="Array">Target array to fill with name/value pairs.</param>

  var responseHeaders = xhr.getAllResponseHeaders().split(/\r?\n/);
  var i, len;

  for (i = 0, len = responseHeaders.length; i < len; i++) {
    if (responseHeaders[i]) {
      var header = responseHeaders[i].split(": ");
      headers[header[0]] = header[1];
    }
  }

  // Fix to handle Firefox CORS bug
  var requiredHeaders = [
    'Content-Type', 'DataServiceVersion'

    /*, 'Content-Length'
     , 'Cache-Control'
     , 'Access-Control-Expose-Headers'
     , 'X-Content-Type-Options'
     , 'Date'*/
  ];

  for (i = 0; i < requiredHeaders.length; i++) {
    if (headers[requiredHeaders[i]] === undefined &&
      xhr.getResponseHeader(requiredHeaders[i])) {
      headers[requiredHeaders[i]] = xhr.getResponseHeader(requiredHeaders[i]);
    }
  }
};

并在WebAPI的web.config中添加：

        <add name="Access-Control-Expose-Headers" value="DataServiceVersion" />

Breeze错误消息“;”，Chrome中的状态为OK

1 个答案: