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OData Networking

The OData functionality in datajs is based on an httpClient object. The responsibility of the object is to implement an asynchronous network request through a request API.

By default, datajs will use the XMLHttpRequest object in the browser to make a network request. If JSONP is enabled, it will use this technique when the request is for a different domain.

You can use a different httpClient object by setting it on the appropriate API call or, in the case of the cache, by setting the httpClient property on the constructor options.

The default client is available through OData.defaultHttpClient, which is used when the caller doesn't specify one explicitly. You can use this directly as well, for example to implement a custom httpClient that modifies the request and then calls the original behavior. See Custom OData httpClient for a sample.

Because the implementation is based on XMLHttpRequest, some of its constraints are also applicable to datajs. For example:
  • Some headers are restricted and cannot be set, for example Referer.
  • Redirections from the server have limited support. In some formats, relative URLs may be corrupted; in some browsers, the second request may change the headers - in particular, addressing the root of a service http://server/service may redirect to http://server/service/ and cause the request to fail.
  • Cross Domain Requests have limited support.

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Last edited Jun 15, 2011 at 10:42 PM by marcelolr, version 2


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