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Fix undefined xhr bug (#3262)
Closes #3261
Bug introduced in commit f9be41720
("Minor tweak for RetrieveETag
(#3257)", 2018-05-05)
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@ -25,10 +25,10 @@ var RetrieveETag = function(self) {
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type: "HEAD",
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headers: headers,
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callback: function(err, data, xhr) {
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if(err) return;
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var etag = xhr.getResponseHeader("ETag");
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if(!err && etag) {
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self.etag = etag.replace(/^W\//,"");
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}
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if(!etag) return;
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self.etag = etag.replace(/^W\//,"");
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}
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});
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};
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