Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_not_modified_filter_module.c @ 4247:b79dbadb3d5e stable-1.0
Merging r4147, r4148, r4149, r4150, r4207:
Fixes of combination of error_page and return directives:
*) Fix for incorrect 201 replies from dav module.
Replies with 201 code contain body, and we should clearly indicate it's
empty if it's empty. Before 0.8.32 chunked was explicitly disabled for
201 replies and as a result empty body was indicated by connection close
(not perfect, but worked). Since 0.8.32 chunked is enabled, and this
causes incorrect responses from dav module when HTTP/1.1 is used: with
"Transfer-Encoding: chunked" but no chunks at all.
Fix is to actually return empty body in special response handler instead
of abusing r->header_only flag.
See here for initial report:
http://mailman.nginx.org/pipermail/nginx-ru/2010-October/037535.html
*) Fix for double content when return is used in error_page handler.
Test case:
location / {
error_page 405 /nope;
return 405;
}
location /nope {
return 200;
}
This is expected to return 405 with empty body, but in 0.8.42+ will return
builtin 405 error page as well (though not counted in Content-Length, thus
breaking protocol).
Fix is to use status provided by rewrite script execution in case
it's less than NGX_HTTP_BAD_REQUEST even if r->error_status set. This
check is in line with one in ngx_http_script_return_code().
Note that this patch also changes behaviour for "return 302 ..." and
"rewrite ... redirect" used as error handler. E.g.
location / {
error_page 405 /redirect;
return 405;
}
location /redirect {
rewrite ^ http://example.com/;
}
will actually return redirect to "http://example.com/" instead of builtin
405 error page with meaningless Location header. This looks like correct
change and it's in line with what happens on e.g. directory redirects
in error handlers.
*) Fix for "return 202" not discarding body.
Big POST (not fully preread) to a
location / {
return 202;
}
resulted in incorrect behaviour due to "return" code path not calling
ngx_http_discard_request_body(). The same applies to all "return" used
with 2xx/3xx codes except 201 and 204, and to all "return ... text" uses.
Fix is to add ngx_http_discard_request_body() call to
ngx_http_send_response() function where it looks appropriate.
Discard body call from emtpy gif module removed as it's now redundant.
Reported by Pyry Hakulinen, see
http://mailman.nginx.org/pipermail/nginx/2011-August/028503.html
*) Incorrect special case for "return 204" removed.
The special case in question leads to replies without body in
configuration like
location / { error_page 404 /zero; return 404; }
location /zero { return 204; }
while replies with empty body are expected per protocol specs.
Correct one will look like
if (status == NGX_HTTP_NO_CONTENT) {
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || r->header_only) {
return rc;
}
return ngx_http_send_special(r, NGX_HTTP_LAST);
}
though it looks like it's better to drop this special case at all.
*) Clear old Location header (if any) while adding a new one.
This prevents incorrect behaviour when another redirect is issued within
error_page 302 handler.
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 01 Nov 2011 13:45:33 +0000 |
parents | 80cc7c8bb845 |
children | d620f497c50f |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_http.h> |
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12 static ngx_int_t ngx_http_test_precondition(ngx_http_request_t *r); |
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13 static ngx_int_t ngx_http_test_not_modified(ngx_http_request_t *r); |
681 | 14 static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf); |
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17 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = { |
509 | 18 NULL, /* preconfiguration */ |
681 | 19 ngx_http_not_modified_filter_init, /* postconfiguration */ |
177
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21 NULL, /* create main configuration */ |
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22 NULL, /* init main configuration */ |
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23 |
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24 NULL, /* create server configuration */ |
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25 NULL, /* merge server configuration */ |
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26 |
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27 NULL, /* create location configuration */ |
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28 NULL /* merge location configuration */ |
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29 }; |
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31 |
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32 ngx_module_t ngx_http_not_modified_filter_module = { |
509 | 33 NGX_MODULE_V1, |
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34 &ngx_http_not_modified_filter_module_ctx, /* module context */ |
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35 NULL, /* module directives */ |
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36 NGX_HTTP_MODULE, /* module type */ |
541 | 37 NULL, /* init master */ |
681 | 38 NULL, /* init module */ |
541 | 39 NULL, /* init process */ |
40 NULL, /* init thread */ | |
41 NULL, /* exit thread */ | |
42 NULL, /* exit process */ | |
43 NULL, /* exit master */ | |
44 NGX_MODULE_V1_PADDING | |
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45 }; |
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46 |
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47 |
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48 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
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49 |
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50 |
2702 | 51 static ngx_int_t |
52 ngx_http_not_modified_header_filter(ngx_http_request_t *r) | |
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53 { |
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54 if (r->headers_out.status != NGX_HTTP_OK |
597 | 55 || r != r->main |
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56 || r->headers_out.last_modified_time == -1) |
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57 { |
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58 return ngx_http_next_header_filter(r); |
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59 } |
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60 |
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61 if (r->headers_in.if_unmodified_since) { |
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62 return ngx_http_test_precondition(r); |
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63 } |
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64 |
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65 if (r->headers_in.if_modified_since) { |
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66 return ngx_http_test_not_modified(r); |
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67 } |
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68 |
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69 return ngx_http_next_header_filter(r); |
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70 } |
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71 |
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72 |
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73 static ngx_int_t |
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74 ngx_http_test_precondition(ngx_http_request_t *r) |
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75 { |
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76 time_t iums; |
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77 |
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78 iums = ngx_http_parse_time(r->headers_in.if_unmodified_since->value.data, |
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79 r->headers_in.if_unmodified_since->value.len); |
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80 |
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81 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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82 "http iums:%d lm:%d", iums, r->headers_out.last_modified_time); |
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83 |
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84 if (iums >= r->headers_out.last_modified_time) { |
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85 return ngx_http_next_header_filter(r); |
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86 } |
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87 |
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88 return ngx_http_filter_finalize_request(r, NULL, |
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89 NGX_HTTP_PRECONDITION_FAILED); |
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90 } |
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91 |
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92 |
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93 static ngx_int_t |
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94 ngx_http_test_not_modified(ngx_http_request_t *r) |
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95 { |
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96 time_t ims; |
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97 ngx_http_core_loc_conf_t *clcf; |
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98 |
2496 | 99 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
100 | |
101 if (clcf->if_modified_since == NGX_HTTP_IMS_OFF) { | |
102 return ngx_http_next_header_filter(r); | |
103 } | |
104 | |
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105 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data, |
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106 r->headers_in.if_modified_since->value.len); |
577 | 107 |
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108 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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109 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time); |
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110 |
2361 | 111 if (ims != r->headers_out.last_modified_time) { |
112 | |
2496 | 113 if (clcf->if_modified_since == NGX_HTTP_IMS_EXACT |
2361 | 114 || ims < r->headers_out.last_modified_time) |
115 { | |
116 return ngx_http_next_header_filter(r); | |
117 } | |
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118 } |
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119 |
2361 | 120 r->headers_out.status = NGX_HTTP_NOT_MODIFIED; |
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Igor Sysoev <igor@sysoev.ru>
parents:
2496
diff
changeset
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121 r->headers_out.status_line.len = 0; |
2361 | 122 r->headers_out.content_type.len = 0; |
123 ngx_http_clear_content_length(r); | |
124 ngx_http_clear_accept_ranges(r); | |
125 | |
3308
793ae4dd91e9
remove "Content-Encoding: gzip" in 304 response
Igor Sysoev <igor@sysoev.ru>
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2702
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126 if (r->headers_out.content_encoding) { |
793ae4dd91e9
remove "Content-Encoding: gzip" in 304 response
Igor Sysoev <igor@sysoev.ru>
parents:
2702
diff
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127 r->headers_out.content_encoding->hash = 0; |
793ae4dd91e9
remove "Content-Encoding: gzip" in 304 response
Igor Sysoev <igor@sysoev.ru>
parents:
2702
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128 r->headers_out.content_encoding = NULL; |
793ae4dd91e9
remove "Content-Encoding: gzip" in 304 response
Igor Sysoev <igor@sysoev.ru>
parents:
2702
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129 } |
793ae4dd91e9
remove "Content-Encoding: gzip" in 304 response
Igor Sysoev <igor@sysoev.ru>
parents:
2702
diff
changeset
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130 |
155
46eb23d9471d
nginx-0.0.1-2003-10-22-20:38:26 import
Igor Sysoev <igor@sysoev.ru>
parents:
153
diff
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131 return ngx_http_next_header_filter(r); |
135
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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132 } |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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133 |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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134 |
2702 | 135 static ngx_int_t |
136 ngx_http_not_modified_filter_init(ngx_conf_t *cf) | |
135
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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137 { |
155
46eb23d9471d
nginx-0.0.1-2003-10-22-20:38:26 import
Igor Sysoev <igor@sysoev.ru>
parents:
153
diff
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138 ngx_http_next_header_filter = ngx_http_top_header_filter; |
135
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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139 ngx_http_top_header_filter = ngx_http_not_modified_header_filter; |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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140 |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
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141 return NGX_OK; |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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142 } |