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I am working with an embedded platform that has 16MB of RAM only. And I need to deep packet filter HTTP streams. To prevent a Denial of Service attack on the device I'd like some statistical averages regarding HTTP stream sizes, specifically the HTTP header in particular.
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The default HTTP Request Header value is 8190 bytes.
The content-length is the size of the compressed message body, in "octets" (i.e. in units of 8 bits, which happen to be "bytes" for all modern computers). The size of the actual message body can be something else, perhaps 150280 bytes.
The Content-Length header indicates the size of the message body, in bytes, sent to the recipient.
You can Use HTTPRequest and HTTPResponse class method getBodyAsBlob(); to get the response body in blob and then you can check the size. httpRequest. getBodyAsBlob(). size(); httpResponse.
From Google's SPDY research project whitepaper
Uncompressed request and response headers. Request headers today vary in size from ~200 bytes to over 2KB. As applications use more cookies and user agents expand features, typical header sizes of 700-800 bytes is common.
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