Use https wherever possible

lib/lz4.c

@@ -63,7 +63,7 @@
  * Method 2 : direct access. This method is portable but violate C standard.
  *            It can generate buggy code on targets which generate assembly depending on alignment.
  *            But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6)
- * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details.
+ * See https://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details.
  * Prefer these methods in priority order (0 > 1 > 2)
  */
 #ifndef LZ4_FORCE_MEMORY_ACCESS   /* can be defined externally, on command line for example */

lib/xxhash.c

@@ -46,7 +46,7 @@
  * Method 2 : direct access. This method doesn't depend on compiler but violate C standard.
  *            It can generate buggy code on targets which do not support unaligned memory accesses.
  *            But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6)
- * See http://stackoverflow.com/a/32095106/646947 for details.
+ * See https://stackoverflow.com/a/32095106/646947 for details.
  * Prefer these methods in priority order (0 > 1 > 2)
  */
 #ifndef XXH_FORCE_MEMORY_ACCESS   /* can be defined externally, on command line for example */
@@ -167,7 +167,7 @@ static U64 XXH_read64(const void* ptr) { return ((const unalign*)ptr)->u64; }
 #else
 
 /* portable and safe solution. Generally efficient.
- * see : http://stackoverflow.com/a/32095106/646947
+ * see : https://stackoverflow.com/a/32095106/646947
  */
 
 static U32 XXH_read32(const void* memPtr)

versionsTest/test-lz4-versions.py

@@ -38,7 +38,7 @@ def get_git_tags():
     tags = stdout.decode('utf-8').split()
     return tags
 
-# http://stackoverflow.com/a/19711609/2132223
+# https://stackoverflow.com/a/19711609/2132223
 def sha1_of_file(filepath):
     with open(filepath, 'rb') as f:
         return hashlib.sha1(f.read()).hexdigest()