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Author: Pekka Helenius (~Fincer), 2018
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This patch may break things badly, just be aware and proceed with care! Thanks.
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This is an experimental patch, just introducing the principle of manipulating HTTP header response codes returned by
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Apache HTTP server to a client. The patch is mainly for personal use, nothing else. If you see it worth it, feel free
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to use it.
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And absolutely, feel free to modify it! If you see it just awful, ignore it. Thanks.
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The patch breaks HTTP standard by altering HTTP header response codes generated by Apache HTTP server. Generated codes are:
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If client request generates HTTP response code 401, the server returns error code 401.
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If client request generates HTTP response code 401->, the server returns error code 400.
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If client request generates HTTP response code 500->, the server returns error code 400 instead.
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Any other codes (100-308) will be returned normally, including 200 OK message.
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Remember to comment any unsupported ErrorDocument directive fields from your VirtualHost configurations
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before starting the server with this patch applied.
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All Apache HTTP response codes are listed in 'modules/http/http_protocol.c' file.
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--- a/modules/http/http_protocol.c
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+++ b/modules/http/http_protocol.c
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@@ -1003,7 +1003,20 @@ AP_DECLARE(int) ap_index_of_response(int
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if (status < 100) {
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pos = (status + shortcut[i]);
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if (pos < shortcut[i + 1] && status_lines[pos] != NULL) {
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- return pos;
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+ if (shortcut[i] == LEVEL_400) { /* If code class is 400 */
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+ if (pos != (1 + shortcut[i])) { /* If code in 400 class is not 401, then */
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+ return (0 + shortcut[i]); /* Return 400 */
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+ }
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+ else {
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+ return pos; /* Else return 401 */
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+ }
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+ }
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+ else if (shortcut[i] == LEVEL_500) { /* If code class is 500 */
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+ return (0 + shortcut[i - 1]); /* Return first value of previous code class 400 */
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+ }
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+ else {
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+ return pos; /* Return normal code */
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+ }
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}
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else {
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return LEVEL_500; /* status unknown (falls in gap) */
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