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Problem with setRequestHeader (X-FILE-NAME) - Cannot convert string to ByteString because the character at index 0 has value 1044 which is greater than 255.

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In version 23 Firefox correctly send non-utf-8 filename via JavaScript if this construction used: xhr.setRequestHeader('X-FILE-NAME', event.dataTransfer.files[0].name);

But in version 24.0 this construction doesn't work and throw exception "Cannot convert string to ByteString because the character at index 0 has value 1044 which is greater than 255.".

How can I fix this error?

In version 23 Firefox correctly send non-utf-8 filename via JavaScript if this construction used: xhr.setRequestHeader('X-FILE-NAME', event.dataTransfer.files[0].name); But in version 24.0 this construction doesn't work and throw exception "Cannot convert string to ByteString because the character at index 0 has value 1044 which is greater than 255.". How can I fix this error?

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A good place to ask advice about web development is at the mozillaZine "Web Development/Standards Evangelism" forum.

The helpers at that forum are more knowledgeable about web development issues.
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