TYPO3 Core

The merger already has the relevant code to check filenames for being an url and fetch them if needed. This just needs to be split out and be called in both places.

TypoScript-code to reproduce it:
page = PAGE
page {
config {
compressCss = 1
concatenateCss = 1
extTarget = _blank
}

includeCSS {
    accordionCss = http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css
    accordionCss.excludeFromConcatenation = 1
    #accordionCss.disableCompression = 1
    accordionCss.external = 1
    accordionCssOverwritten = fileadmin/sys/Public/StyleSheet/accordionCssOverwritten.css
  }
}

• excludeFromConcatenation BUT NOT disableCompression (like here): empty file gets compressed
• excludeFromConcatenation AND disableCompression: external file gets referenced directly (external URL is kept as is)
• excludeFromConcatenation: file is fetched be the merger already and afterwards exists as a "local" file

Patch set 2 for branch master has been pushed to the review server.
It is available at https://review.typo3.org/24471

The same goes for JS of course (added with patchset 2 on gerrit).

page {
  config {
    compressJs = 1
    concatenateJs = 1
  }
  includeJS {
    jquery = http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js
    jquery.excludeFromConcatenation = 1
    #jquery.disableCompression = 1
    jquery.external = 1
  }
 }

Patch set 3 for branch master has been pushed to the review server.
It is available at https://review.typo3.org/24471

Patch set 4 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/24471

Patch set 5 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/24471

Patch set 6 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/24471

Patch set 7 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/24471

Patch set 8 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/24471

Patch set 9 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/24471

Patch set 10 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/24471