Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_slice_filter_module.c @ 8294:ba9e34c03968 quic
QUIC: added check of client transport parameters.
Parameters sent by client are verified and defaults are set for parameters
omitted by client.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Mon, 15 Feb 2021 14:05:46 +0300 |
parents | 32a343635b50 |
children |
rev | line source |
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6317 | 1 |
2 /* | |
3 * Copyright (C) Roman Arutyunyan | |
4 * Copyright (C) Nginx, Inc. | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
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14 size_t size; |
6317 | 15 } ngx_http_slice_loc_conf_t; |
16 | |
17 | |
18 typedef struct { | |
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19 off_t start; |
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20 off_t end; |
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21 ngx_str_t range; |
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22 ngx_str_t etag; |
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23 unsigned last:1; |
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24 unsigned active:1; |
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25 ngx_http_request_t *sr; |
6317 | 26 } ngx_http_slice_ctx_t; |
27 | |
28 | |
29 typedef struct { | |
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30 off_t start; |
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31 off_t end; |
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32 off_t complete_length; |
6317 | 33 } ngx_http_slice_content_range_t; |
34 | |
35 | |
36 static ngx_int_t ngx_http_slice_header_filter(ngx_http_request_t *r); | |
37 static ngx_int_t ngx_http_slice_body_filter(ngx_http_request_t *r, | |
38 ngx_chain_t *in); | |
39 static ngx_int_t ngx_http_slice_parse_content_range(ngx_http_request_t *r, | |
40 ngx_http_slice_content_range_t *cr); | |
41 static ngx_int_t ngx_http_slice_range_variable(ngx_http_request_t *r, | |
42 ngx_http_variable_value_t *v, uintptr_t data); | |
43 static off_t ngx_http_slice_get_start(ngx_http_request_t *r); | |
44 static void *ngx_http_slice_create_loc_conf(ngx_conf_t *cf); | |
45 static char *ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, | |
46 void *child); | |
47 static ngx_int_t ngx_http_slice_add_variables(ngx_conf_t *cf); | |
48 static ngx_int_t ngx_http_slice_init(ngx_conf_t *cf); | |
49 | |
50 | |
51 static ngx_command_t ngx_http_slice_filter_commands[] = { | |
52 | |
53 { ngx_string("slice"), | |
54 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
55 ngx_conf_set_size_slot, | |
56 NGX_HTTP_LOC_CONF_OFFSET, | |
57 offsetof(ngx_http_slice_loc_conf_t, size), | |
58 NULL }, | |
59 | |
60 ngx_null_command | |
61 }; | |
62 | |
63 | |
64 static ngx_http_module_t ngx_http_slice_filter_module_ctx = { | |
65 ngx_http_slice_add_variables, /* preconfiguration */ | |
66 ngx_http_slice_init, /* postconfiguration */ | |
67 | |
68 NULL, /* create main configuration */ | |
69 NULL, /* init main configuration */ | |
70 | |
71 NULL, /* create server configuration */ | |
72 NULL, /* merge server configuration */ | |
73 | |
74 ngx_http_slice_create_loc_conf, /* create location configuration */ | |
75 ngx_http_slice_merge_loc_conf /* merge location configuration */ | |
76 }; | |
77 | |
78 | |
79 ngx_module_t ngx_http_slice_filter_module = { | |
80 NGX_MODULE_V1, | |
81 &ngx_http_slice_filter_module_ctx, /* module context */ | |
82 ngx_http_slice_filter_commands, /* module directives */ | |
83 NGX_HTTP_MODULE, /* module type */ | |
84 NULL, /* init master */ | |
85 NULL, /* init module */ | |
86 NULL, /* init process */ | |
87 NULL, /* init thread */ | |
88 NULL, /* exit thread */ | |
89 NULL, /* exit process */ | |
90 NULL, /* exit master */ | |
91 NGX_MODULE_V1_PADDING | |
92 }; | |
93 | |
94 | |
95 static ngx_str_t ngx_http_slice_range_name = ngx_string("slice_range"); | |
96 | |
97 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
98 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
99 | |
100 | |
101 static ngx_int_t | |
102 ngx_http_slice_header_filter(ngx_http_request_t *r) | |
103 { | |
104 off_t end; | |
105 ngx_int_t rc; | |
106 ngx_table_elt_t *h; | |
107 ngx_http_slice_ctx_t *ctx; | |
108 ngx_http_slice_loc_conf_t *slcf; | |
109 ngx_http_slice_content_range_t cr; | |
110 | |
111 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
112 if (ctx == NULL) { | |
113 return ngx_http_next_header_filter(r); | |
114 } | |
115 | |
116 if (r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT) { | |
117 if (r == r->main) { | |
118 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module); | |
119 return ngx_http_next_header_filter(r); | |
120 } | |
121 | |
122 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
123 "unexpected status code %ui in slice response", | |
124 r->headers_out.status); | |
125 return NGX_ERROR; | |
126 } | |
127 | |
128 h = r->headers_out.etag; | |
129 | |
130 if (ctx->etag.len) { | |
131 if (h == NULL | |
132 || h->value.len != ctx->etag.len | |
133 || ngx_strncmp(h->value.data, ctx->etag.data, ctx->etag.len) | |
134 != 0) | |
135 { | |
136 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
137 "etag mismatch in slice response"); | |
138 return NGX_ERROR; | |
139 } | |
140 } | |
141 | |
142 if (h) { | |
143 ctx->etag = h->value; | |
144 } | |
145 | |
146 if (ngx_http_slice_parse_content_range(r, &cr) != NGX_OK) { | |
147 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
148 "invalid range in slice response"); | |
149 return NGX_ERROR; | |
150 } | |
151 | |
152 if (cr.complete_length == -1) { | |
153 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
154 "no complete length in slice response"); | |
155 return NGX_ERROR; | |
156 } | |
157 | |
158 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
159 "http slice response range: %O-%O/%O", | |
160 cr.start, cr.end, cr.complete_length); | |
161 | |
162 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
163 | |
164 end = ngx_min(cr.start + (off_t) slcf->size, cr.complete_length); | |
165 | |
166 if (cr.start != ctx->start || cr.end != end) { | |
167 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
168 "unexpected range in slice response: %O-%O", | |
169 cr.start, cr.end); | |
170 return NGX_ERROR; | |
171 } | |
172 | |
173 ctx->start = end; | |
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174 ctx->active = 1; |
6317 | 175 |
176 r->headers_out.status = NGX_HTTP_OK; | |
177 r->headers_out.status_line.len = 0; | |
178 r->headers_out.content_length_n = cr.complete_length; | |
179 r->headers_out.content_offset = cr.start; | |
180 r->headers_out.content_range->hash = 0; | |
181 r->headers_out.content_range = NULL; | |
182 | |
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183 if (r->headers_out.accept_ranges) { |
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184 r->headers_out.accept_ranges->hash = 0; |
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185 r->headers_out.accept_ranges = NULL; |
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186 } |
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187 |
6317 | 188 r->allow_ranges = 1; |
189 r->subrequest_ranges = 1; | |
190 r->single_range = 1; | |
191 | |
192 rc = ngx_http_next_header_filter(r); | |
193 | |
194 if (r != r->main) { | |
195 return rc; | |
196 } | |
197 | |
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198 r->preserve_body = 1; |
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199 |
6317 | 200 if (r->headers_out.status == NGX_HTTP_PARTIAL_CONTENT) { |
201 if (ctx->start + (off_t) slcf->size <= r->headers_out.content_offset) { | |
202 ctx->start = slcf->size | |
203 * (r->headers_out.content_offset / slcf->size); | |
204 } | |
205 | |
206 ctx->end = r->headers_out.content_offset | |
207 + r->headers_out.content_length_n; | |
208 | |
209 } else { | |
210 ctx->end = cr.complete_length; | |
211 } | |
212 | |
213 return rc; | |
214 } | |
215 | |
216 | |
217 static ngx_int_t | |
218 ngx_http_slice_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
219 { | |
220 ngx_int_t rc; | |
221 ngx_chain_t *cl; | |
222 ngx_http_slice_ctx_t *ctx; | |
223 ngx_http_slice_loc_conf_t *slcf; | |
224 | |
225 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
226 | |
227 if (ctx == NULL || r != r->main) { | |
228 return ngx_http_next_body_filter(r, in); | |
229 } | |
230 | |
231 for (cl = in; cl; cl = cl->next) { | |
232 if (cl->buf->last_buf) { | |
233 cl->buf->last_buf = 0; | |
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234 cl->buf->last_in_chain = 1; |
6317 | 235 cl->buf->sync = 1; |
236 ctx->last = 1; | |
237 } | |
238 } | |
239 | |
240 rc = ngx_http_next_body_filter(r, in); | |
241 | |
242 if (rc == NGX_ERROR || !ctx->last) { | |
243 return rc; | |
244 } | |
245 | |
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246 if (ctx->sr && !ctx->sr->done) { |
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247 return rc; |
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248 } |
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249 |
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250 if (!ctx->active) { |
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251 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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252 "missing slice response"); |
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253 return NGX_ERROR; |
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254 } |
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255 |
6317 | 256 if (ctx->start >= ctx->end) { |
257 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module); | |
258 ngx_http_send_special(r, NGX_HTTP_LAST); | |
259 return rc; | |
260 } | |
261 | |
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262 if (r->buffered) { |
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263 return rc; |
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264 } |
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265 |
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266 if (ngx_http_subrequest(r, &r->uri, &r->args, &ctx->sr, NULL, |
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267 NGX_HTTP_SUBREQUEST_CLONE) |
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268 != NGX_OK) |
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269 { |
6317 | 270 return NGX_ERROR; |
271 } | |
272 | |
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273 ngx_http_set_ctx(ctx->sr, ctx, ngx_http_slice_filter_module); |
6317 | 274 |
275 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
276 | |
277 ctx->range.len = ngx_sprintf(ctx->range.data, "bytes=%O-%O", ctx->start, | |
278 ctx->start + (off_t) slcf->size - 1) | |
279 - ctx->range.data; | |
280 | |
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281 ctx->active = 0; |
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282 |
6317 | 283 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
284 "http slice subrequest: \"%V\"", &ctx->range); | |
285 | |
286 return rc; | |
287 } | |
288 | |
289 | |
290 static ngx_int_t | |
291 ngx_http_slice_parse_content_range(ngx_http_request_t *r, | |
292 ngx_http_slice_content_range_t *cr) | |
293 { | |
294 off_t start, end, complete_length, cutoff, cutlim; | |
295 u_char *p; | |
296 ngx_table_elt_t *h; | |
297 | |
298 h = r->headers_out.content_range; | |
299 | |
300 if (h == NULL | |
301 || h->value.len < 7 | |
302 || ngx_strncmp(h->value.data, "bytes ", 6) != 0) | |
303 { | |
304 return NGX_ERROR; | |
305 } | |
306 | |
307 p = h->value.data + 6; | |
308 | |
309 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
310 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
311 | |
312 start = 0; | |
313 end = 0; | |
314 complete_length = 0; | |
315 | |
316 while (*p == ' ') { p++; } | |
317 | |
318 if (*p < '0' || *p > '9') { | |
319 return NGX_ERROR; | |
320 } | |
321 | |
322 while (*p >= '0' && *p <= '9') { | |
323 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
324 return NGX_ERROR; | |
325 } | |
326 | |
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327 start = start * 10 + (*p++ - '0'); |
6317 | 328 } |
329 | |
330 while (*p == ' ') { p++; } | |
331 | |
332 if (*p++ != '-') { | |
333 return NGX_ERROR; | |
334 } | |
335 | |
336 while (*p == ' ') { p++; } | |
337 | |
338 if (*p < '0' || *p > '9') { | |
339 return NGX_ERROR; | |
340 } | |
341 | |
342 while (*p >= '0' && *p <= '9') { | |
343 if (end >= cutoff && (end > cutoff || *p - '0' > cutlim)) { | |
344 return NGX_ERROR; | |
345 } | |
346 | |
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347 end = end * 10 + (*p++ - '0'); |
6317 | 348 } |
349 | |
350 end++; | |
351 | |
352 while (*p == ' ') { p++; } | |
353 | |
354 if (*p++ != '/') { | |
355 return NGX_ERROR; | |
356 } | |
357 | |
358 while (*p == ' ') { p++; } | |
359 | |
360 if (*p != '*') { | |
361 if (*p < '0' || *p > '9') { | |
362 return NGX_ERROR; | |
363 } | |
364 | |
365 while (*p >= '0' && *p <= '9') { | |
366 if (complete_length >= cutoff | |
367 && (complete_length > cutoff || *p - '0' > cutlim)) | |
368 { | |
369 return NGX_ERROR; | |
370 } | |
371 | |
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372 complete_length = complete_length * 10 + (*p++ - '0'); |
6317 | 373 } |
374 | |
375 } else { | |
376 complete_length = -1; | |
377 p++; | |
378 } | |
379 | |
380 while (*p == ' ') { p++; } | |
381 | |
382 if (*p != '\0') { | |
383 return NGX_ERROR; | |
384 } | |
385 | |
386 cr->start = start; | |
387 cr->end = end; | |
388 cr->complete_length = complete_length; | |
389 | |
390 return NGX_OK; | |
391 } | |
392 | |
393 | |
394 static ngx_int_t | |
395 ngx_http_slice_range_variable(ngx_http_request_t *r, | |
396 ngx_http_variable_value_t *v, uintptr_t data) | |
397 { | |
398 u_char *p; | |
399 ngx_http_slice_ctx_t *ctx; | |
400 ngx_http_slice_loc_conf_t *slcf; | |
401 | |
402 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
403 | |
404 if (ctx == NULL) { | |
405 if (r != r->main || r->headers_out.status) { | |
406 v->not_found = 1; | |
407 return NGX_OK; | |
408 } | |
409 | |
410 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
411 | |
412 if (slcf->size == 0) { | |
413 v->not_found = 1; | |
414 return NGX_OK; | |
415 } | |
416 | |
417 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_slice_ctx_t)); | |
418 if (ctx == NULL) { | |
419 return NGX_ERROR; | |
420 } | |
421 | |
422 ngx_http_set_ctx(r, ctx, ngx_http_slice_filter_module); | |
423 | |
424 p = ngx_pnalloc(r->pool, sizeof("bytes=-") - 1 + 2 * NGX_OFF_T_LEN); | |
425 if (p == NULL) { | |
426 return NGX_ERROR; | |
427 } | |
428 | |
429 ctx->start = slcf->size * (ngx_http_slice_get_start(r) / slcf->size); | |
430 | |
431 ctx->range.data = p; | |
432 ctx->range.len = ngx_sprintf(p, "bytes=%O-%O", ctx->start, | |
433 ctx->start + (off_t) slcf->size - 1) | |
434 - p; | |
435 } | |
436 | |
437 v->data = ctx->range.data; | |
438 v->valid = 1; | |
439 v->not_found = 0; | |
440 v->no_cacheable = 1; | |
441 v->len = ctx->range.len; | |
442 | |
443 return NGX_OK; | |
444 } | |
445 | |
446 | |
447 static off_t | |
448 ngx_http_slice_get_start(ngx_http_request_t *r) | |
449 { | |
450 off_t start, cutoff, cutlim; | |
451 u_char *p; | |
452 ngx_table_elt_t *h; | |
453 | |
454 if (r->headers_in.if_range) { | |
455 return 0; | |
456 } | |
457 | |
458 h = r->headers_in.range; | |
459 | |
460 if (h == NULL | |
461 || h->value.len < 7 | |
462 || ngx_strncasecmp(h->value.data, (u_char *) "bytes=", 6) != 0) | |
463 { | |
464 return 0; | |
465 } | |
466 | |
467 p = h->value.data + 6; | |
468 | |
469 if (ngx_strchr(p, ',')) { | |
470 return 0; | |
471 } | |
472 | |
473 while (*p == ' ') { p++; } | |
474 | |
475 if (*p == '-') { | |
476 return 0; | |
477 } | |
478 | |
479 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
480 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
481 | |
482 start = 0; | |
483 | |
484 while (*p >= '0' && *p <= '9') { | |
485 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
486 return 0; | |
487 } | |
488 | |
7067
e3723f2a11b7
Parenthesized ASCII-related calculations.
Valentin Bartenev <vbart@nginx.com>
parents:
6963
diff
changeset
|
489 start = start * 10 + (*p++ - '0'); |
6317 | 490 } |
491 | |
492 return start; | |
493 } | |
494 | |
495 | |
496 static void * | |
497 ngx_http_slice_create_loc_conf(ngx_conf_t *cf) | |
498 { | |
499 ngx_http_slice_loc_conf_t *slcf; | |
500 | |
501 slcf = ngx_palloc(cf->pool, sizeof(ngx_http_slice_loc_conf_t)); | |
502 if (slcf == NULL) { | |
503 return NULL; | |
504 } | |
505 | |
506 slcf->size = NGX_CONF_UNSET_SIZE; | |
507 | |
508 return slcf; | |
509 } | |
510 | |
511 | |
512 static char * | |
513 ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
514 { | |
515 ngx_http_slice_loc_conf_t *prev = parent; | |
516 ngx_http_slice_loc_conf_t *conf = child; | |
517 | |
518 ngx_conf_merge_size_value(conf->size, prev->size, 0); | |
519 | |
520 return NGX_CONF_OK; | |
521 } | |
522 | |
523 | |
524 static ngx_int_t | |
525 ngx_http_slice_add_variables(ngx_conf_t *cf) | |
526 { | |
527 ngx_http_variable_t *var; | |
528 | |
529 var = ngx_http_add_variable(cf, &ngx_http_slice_range_name, 0); | |
530 if (var == NULL) { | |
531 return NGX_ERROR; | |
532 } | |
533 | |
534 var->get_handler = ngx_http_slice_range_variable; | |
535 | |
536 return NGX_OK; | |
537 } | |
538 | |
539 | |
540 static ngx_int_t | |
541 ngx_http_slice_init(ngx_conf_t *cf) | |
542 { | |
543 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
544 ngx_http_top_header_filter = ngx_http_slice_header_filter; | |
545 | |
546 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
547 ngx_http_top_body_filter = ngx_http_slice_body_filter; | |
548 | |
549 return NGX_OK; | |
550 } |