trailpack-mapnik/test/xml/gdal_osm_basemap_cache.xml

Mapnik Tile Server with Trails.js

<GDAL_WMS>
  <Service name="TMS">
    <ServerUrl>http://d1gs2ejst5lc1o.cloudfront.net/streets/${z}/${x}/${y}/mq.512px.png</ServerUrl>
    <SRS>EPSG:3857</SRS>
    <Format>png</Format>
    <ImageFormat>image/png</ImageFormat>
    <Transparent>TRUE</Transparent>
  </Service>

  <DataWindow>
    <UpperLeftX>-20037508.34</UpperLeftX>
    <LowerRightX>20037508.34</LowerRightX>
    <UpperLeftY>20037508.34</UpperLeftY>
    <LowerRightY>-20037508.34</LowerRightY>

    <TileLevel>18</TileLevel>
    <TileCountX>1</TileCountX>
    <TileCountY>1</TileCountY>
    <YOrigin>top</YOrigin>
  </DataWindow>

  <Projection>EPSG:3857</Projection>
  <BlockSizeX>512</BlockSizeX>
  <BlockSizeY>512</BlockSizeY>
  <BandsCount>3</BandsCount>
  <MaxConnections>32</MaxConnections>
  <AdviseRead>true</AdviseRead>
  <VerifyAdviseRead>true</VerifyAdviseRead>

  <!--
  <Cache>
    <Path>.tmp/gdal/topo</Path>
    <Depth>2</Depth>
    <Extension>.jpg</Extension>
  </Cache>
  -->

  <UnsafeSSL>true</UnsafeSSL>
  <ZeroBlockHttpCodes>204,403,404,500,502,503,504</ZeroBlockHttpCodes>
  <ZeroBlockOnServerException>true</ZeroBlockOnServerException>
</GDAL_WMS>