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Product Advertising API
Developer Guide (API Version 2013-08-01)

Spaces in Requests

Because a REST request is a URL, there can be no spaces between the parts of a request. A browser will stop reading when it encounters the first space. For example, if the last parameter is Keywords=Blue Shirts, the request will end at Blue. You must URL-encode spaces with %20. The following example includes a URL-encoded space.

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Keywords=Blue%20Shirts

The same problem occurs if you have spaces between the parameters in a request.

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SearchIndex=Apparel& Keywords=Shirt

In the example, the request ends at Apparel&. This returns an error, because required parameters are not read. As a best practice, verify spaces are removed or URL-encoded.