`Case 5:18-md-02834—BLF Document 507-6 Filed 08/26/19 Page 1 of 3
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`EXHIBIT 5
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`EXHIBIT 5
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`Case 5:18-md-02834-BLF Document 507-6 Filed 08/26/19 Page 2 of 3
`Case 5:18-md-02834-BLF Document 507-6 Filed 08/26/19 Page 2 of 3
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`UNITED STATES DISTRICT COURT
`
`FOR THE NORTHERN DISTRICT OF CALIFORNIA
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`SAN JOSE DIVISION
`
`IN RE PERSONALWEB
`TECHNOLOGIES, LLC, ET AL.,
`PATENT LITIGATION
`
`Case No.: 5:18-md-02834-BLF
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`PERSONALWEB TECHNOLOGIES,
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`LLC, et. al.,
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`Plaintiffs,
`
`v‘
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`TWITCH INTERACTIVE, INC.,
`Defendant.
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`
`
`Case No.: 5:18-cv-05619-BLF
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`TECHNICAL EXPERT REPORT OF ERIK DE LA IGLESIA
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`HIGHLY CONFIDENTIAL — ATTORNEYS’ EYES ONLY
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`Executed this 23rd day ofAugust", 2019 in .mL/m‘ar'u M; w , California.
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`
`
`Erik de la Iglesia
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`
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`Case 5:18-md-02834-BLF Document 507-6 Filed 08/26/19 Page 3 of 3
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`to determine whether the received ETag value matches the current ETag value for the content of
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`the object referenced in the request (i.e. the URI of the file conditionally requested).
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`179. After the comparison, if there was a matching ETag value for the content of an
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`object referenced in the conditional GET request the Twitch web servers determined that the
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`cached content was still the valid content, and therefore served a 304 NOT MODIFIED response
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`message indicating to the browser that it has valid rights to keep using the cached contents for
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`the duration specified by the max-age value set by Twitch and also sent in the 304 response. If
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`the comparison resulted in a non-matching ETag value for the content of an object referenced in
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`the conditional GET request the Twitch web servers determined that the browser did not have the
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`valid content in its cache for that URI, and served a 200 OK response message containing the
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`valid content, the valid ETag value, and a new max-age specifying how the time duration for
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`which the new content would be valid to be cached and used by the browser without subsequent
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`revalidation.
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`180. Additional details regarding the receipt of conditional GET requests, comparison
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`of ETags in conditional GET requests and service of 200 OK and 304 NOT MODIFIED
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`response messages by the Twitch web servers are provided in paragraphs 90, 100, 101, and 102
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`hereto, and the source code, HTTP protocol specifications, and portions of Appendix C cited
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`therein, which are incorporated herein by reference.
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`F.
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`Exemplary Evidence
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`181.
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`In this report, I have demonstrated that the Accused Instrumentality included and
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`practiced all of the limitations of the claimed system and methods based on an examination of
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`exemplary webpage base files and asset files captured on certain dates during the Relevant Time
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`–59–
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