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HTTP: Consider tab as whitespace in field value

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HTTP considers 0x09 (horizontal tab) to be valid horizontal whitespace
in a field value, and there are badly-behaved clients in the wild that
rely on this behavior and cannot be fixed.  This also ensures that NGINX
is not itself such a badly-behaved client and that, for HTTP/1.x
requests, the values of the $http_* variables agree with what upstream
servers will see.

Fixes: #187
This commit is contained in:
Demi Marie Obenour 2025-03-14 21:14:01 -04:00
parent 9785db9bd5
commit 40948bea5f
1 changed files with 3 additions and 0 deletions
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3
src/http/ngx_http_parse.c
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@ -972,6 +972,7 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
case sw_space_before_value:
switch (ch) {
case ' ':
case '\t':
break;
case CR:
r->header_start = p;
@ -996,6 +997,7 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
case sw_value:
switch (ch) {
case ' ':
case '\t':
r->header_end = p;
state = sw_space_after_value;
break;
@ -1016,6 +1018,7 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
case sw_space_after_value:
switch (ch) {
case ' ':
case '\t':
break;
case CR:
state = sw_almost_done;