Caused by: java.util.zip.ZipException: Not in GZIP format
        at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:164)
        at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:78)
        at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:90)
        at org.apache.http.client.protocol.ResponseContentEncoding$1.create(ResponseContentEncoding.java:67)
        at org.apache.http.client.entity.LazyDecompressingInputStream.initWrapper(LazyDecompressingInputStream.java:54)
        at org.apache.http.client.entity.LazyDecompressingInputStream.read(LazyDecompressingInputStream.java:66)
        at org.apache.http.client.entity.DecompressingEntity.writeTo(DecompressingEntity.java:94)
        at org.ametys.site.GeneratePageAction._writePageOnDisk(GeneratePageAction.java:280)
        ... 60 more