[Webkit-unassigned] [Bug 207777] New: Set User-Agent in preconnect requests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207777

            Bug ID: 207777
           Summary: Set User-Agent in preconnect requests
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nham at apple.com
                CC: beidson at apple.com

When using an HTTPS proxy, CFNetwork will not reuse a preconnected socket if the User-Agent on the preconnect request doesn't match the User-Agent of the actual request (<rdar://problem/59434166>). To work around this, we should set the User-Agent on preconnect requests.

In addition, this patch moves the preconnect request from WebProcess::loadRequest in the WebProcess to WebProcessProxy::loadRequest in the UIProcess. This is because there can be long sync IPCs that last >100 ms that occur before WebProcess::loadRequest even starts, e.g. https://bugs.webkit.org/show_bug.cgi?id=203165.

By making both changes, we see a ~2% improvement in PLT5 times.

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