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-rw-r--r--networking/wget.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/networking/wget.c b/networking/wget.c
index 4eafebe..ce2f514 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -328,8 +328,16 @@ static char *gethdr(FILE *fp)
return NULL;
/* convert the header name to lower case */
- for (s = G.wget_buf; isalnum(*s) || *s == '-' || *s == '.'; ++s) {
- /* tolower for "A-Z", no-op for "0-9a-z-." */
+ for (s = G.wget_buf; isalnum(*s) || *s == '-' || *s == '.' || *s == '_'; ++s) {
+ /*
+ * No-op for 20-3f and 60-7f. "0-9a-z-." are in these ranges.
+ * 40-5f range ("@A-Z[\]^_") maps to 60-7f.
+ * "A-Z" maps to "a-z".
+ * "@[\]" can't occur in header names.
+ * "^_" maps to "~,DEL" (which is wrong).
+ * "^" was never seen yet, "_" was seen from web.archive.org
+ * (x-archive-orig-x_commoncrawl_Signature: HEXSTRING).
+ */
*s |= 0x20;
}