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Content-Length header is missing when I try to download rar, exe, msi static files, though response for images contains Content-Length, but if I change rar extension to jpg it doesn't.
How do I solve this?
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To check this Content-Length in action go to Inspect Element -> Network check the request header for Content-Length like below, Content-Length is highlighted.
The Content-Length is optional in an HTTP request. For a GET or DELETE the length must be zero. For POST, if Content-Length is specified and it does not match the length of the message-line, the message is either truncated, or padded with nulls to the specified length.
The Content-Length header is mandatory for messages with entity bodies, unless the message is transported using chunked encoding. Content-Length is needed to detect premature message truncation when servers crash and to properly segment messages that share a persistent connection.
14.13 Content-Length The Content-Length entity-header field indicates the size of the entity-body, in decimal number of OCTETs, sent to the recipient or, in the case of the HEAD method, the size of the entity-body that would have been sent had the request been a GET.
What headers do you see? It's possible it's being served using Transfer-Encoding: Chunked, which is a perfectly legitimate way of transferring responses over HTTP.
Also, how are you serving the file - using static files, your code, or the blobstore?
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