{"id":420,"date":"2025-02-07T01:07:40","date_gmt":"2025-02-07T01:07:40","guid":{"rendered":"https:\/\/replicounts.org\/network\/headers\/"},"modified":"2025-02-07T01:07:40","modified_gmt":"2025-02-07T01:07:40","slug":"headers","status":"publish","type":"post","link":"https:\/\/replicounts.org\/vi\/network\/headers\/","title":{"rendered":"Ti\u00eau \u0111\u1ec1"},"content":{"rendered":"

Hi\u1ec3u v\u1ec1 Header trong M\u1ea1ng Proxy<\/h3>\n

Trong b\u1ed1i c\u1ea3nh r\u1ed9ng l\u1edbn v\u00e0 ph\u1ee9c t\u1ea1p c\u1ee7a m\u1ea1ng l\u01b0\u1edbi, header \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong b\u1ed1i c\u1ea3nh m\u1ea1ng proxy. \u0110\u1ec3 n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c t\u1ea7m quan tr\u1ecdng c\u1ee7a ch\u00fang, tr\u01b0\u1edbc ti\u00ean ng\u01b0\u1eddi ta ph\u1ea3i hi\u1ec3u header l\u00e0 g\u00ec \u1edf c\u1ea5p \u0111\u1ed9 k\u1ef9 thu\u1eadt.<\/p>\n

Ti\u00eau \u0111\u1ec1 l\u00e0 g\u00ec?<\/h4>\n

V\u1ec1 b\u1ea3n ch\u1ea5t, header l\u00e0 c\u00e1c g\u00f3i si\u00eau d\u1eef li\u1ec7u \u0111i k\u00e8m v\u1edbi c\u00e1c g\u00f3i d\u1eef li\u1ec7u trong giao ti\u1ebfp m\u1ea1ng. Ch\u00fang cung c\u1ea5p th\u00f4ng tin c\u1ea7n thi\u1ebft v\u1ec1 d\u1eef li\u1ec7u \u0111ang \u0111\u01b0\u1ee3c truy\u1ec1n, ch\u1eb3ng h\u1ea1n nh\u01b0 ngu\u1ed3n, \u0111\u00edch, lo\u1ea1i n\u1ed9i dung v\u00e0 nhi\u1ec1u th\u00f4ng s\u1ed1 \u0111i\u1ec1u khi\u1ec3n v\u00e0 tr\u1ea1ng th\u00e1i kh\u00e1c nhau. H\u00e3y ngh\u0129 header nh\u01b0 phong b\u00ec th\u01b0; trong khi th\u01b0 (d\u1eef li\u1ec7u) truy\u1ec1n t\u1ea3i th\u00f4ng \u0111i\u1ec7p, th\u00ec phong b\u00ec (header) ch\u1ee9a th\u00f4ng tin c\u1ea7n thi\u1ebft \u0111\u1ec3 ph\u00e2n ph\u1ed1i v\u00e0 x\u1eed l\u00fd.<\/p>\n

Trong b\u1ed1i c\u1ea3nh c\u1ee7a Internet Protocol Suite (TCP\/IP), header l\u00e0 c\u00e1c \u0111\u1ecbnh d\u1ea1ng c\u00f3 c\u1ea5u tr\u00fac ch\u1ec9 \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u n\u00ean \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u1edf m\u1ed7i l\u1edbp c\u1ee7a m\u00f4 h\u00ecnh OSI. V\u00ed d\u1ee5, header HTTP qu\u1ea3n l\u00fd c\u00e1ch m\u00e1y ch\u1ee7 web v\u00e0 m\u00e1y kh\u00e1ch giao ti\u1ebfp, trong khi header IP r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ecbnh tuy\u1ebfn c\u00e1c g\u00f3i tin qua m\u1ea1ng.<\/p>\n

T\u01b0\u01a1ng t\u00e1c v\u1edbi Proxy v\u00e0 M\u1ea1ng<\/h4>\n

Proxy ho\u1ea1t \u0111\u1ed9ng nh\u01b0 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho c\u00e1c y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i. Ch\u00fang thao t\u00e1c c\u00e1c ti\u00eau \u0111\u1ec1 \u0111\u1ec3 th\u1ef1c hi\u1ec7n nhi\u1ec1u ch\u1ee9c n\u0103ng kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 \u1ea9n danh, l\u01b0u tr\u1eef \u0111\u1ec7m, l\u1ecdc n\u1ed9i dung v\u00e0 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t. <\/p>\n

Khi m\u00e1y kh\u00e1ch g\u1eedi y\u00eau c\u1ea7u qua proxy, proxy c\u00f3 th\u1ec3 s\u1eeda \u0111\u1ed5i ti\u00eau \u0111\u1ec1 tr\u01b0\u1edbc khi chuy\u1ec3n ti\u1ebfp y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111\u00edch. Ng\u01b0\u1ee3c l\u1ea1i, khi m\u00e1y ch\u1ee7 ph\u1ea3n h\u1ed3i, proxy c\u00f3 th\u1ec3 s\u1eeda \u0111\u1ed5i l\u1ea1i ti\u00eau \u0111\u1ec1 tr\u01b0\u1edbc khi chuy\u1ec3n ph\u1ea3n h\u1ed3i tr\u1edf l\u1ea1i m\u00e1y kh\u00e1ch. Kh\u1ea3 n\u0103ng n\u00e0y cho ph\u00e9p proxy t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt, ki\u1ec3m so\u00e1t l\u01b0u l\u01b0\u1ee3ng v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3.<\/p>\n

V\u00ed d\u1ee5, trong ph\u1ea1m vi \u1ea9n danh, m\u1ed9t proxy c\u00f3 th\u1ec3 x\u00f3a \u0111\u1ecba ch\u1ec9 IP c\u1ee7a m\u00e1y kh\u00e1ch g\u1ed1c kh\u1ecfi ti\u00eau \u0111\u1ec1, thay th\u1ebf b\u1eb1ng \u0111\u1ecba ch\u1ec9 IP c\u1ee7a ch\u00ednh n\u00f3. S\u1eeda \u0111\u1ed5i n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u00e1y kh\u00e1ch v\u1eabn \u1ea9n danh v\u1edbi m\u00e1y ch\u1ee7 \u0111\u00edch.<\/p>\n

C\u00e1c tham s\u1ed1 v\u00e0 \u0111\u1ecbnh d\u1ea1ng ch\u00ednh<\/h4>\n

Ti\u00eau \u0111\u1ec1 bao g\u1ed3m c\u00e1c c\u1eb7p kh\u00f3a-gi\u00e1 tr\u1ecb, trong \u0111\u00f3 m\u1ed7i kh\u00f3a bi\u1ec3u th\u1ecb m\u1ed9t thu\u1ed9c t\u00ednh ho\u1eb7c h\u01b0\u1edbng d\u1eabn c\u1ee5 th\u1ec3 v\u00e0 gi\u00e1 tr\u1ecb cung c\u1ea5p chi ti\u1ebft t\u01b0\u01a1ng \u1ee9ng. Trong HTTP, ti\u00eau \u0111\u1ec1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i th\u00e0nh ti\u00eau \u0111\u1ec1 y\u00eau c\u1ea7u v\u00e0 ti\u00eau \u0111\u1ec1 ph\u1ea3n h\u1ed3i. <\/p>\n

C\u00e1c tham s\u1ed1 ti\u00eau \u0111\u1ec1 HTTP ch\u00ednh bao g\u1ed3m:<\/strong>
\n\u2013 Ch\u1ee7 nh\u00e0:<\/strong> Ch\u1ec9 \u0111\u1ecbnh t\u00ean mi\u1ec1n c\u1ee7a m\u00e1y ch\u1ee7 (v\u00ed d\u1ee5: Host: www.example.com<\/code>).
\n\u2013 T\u00e1c nh\u00e2n ng\u01b0\u1eddi d\u00f9ng:<\/strong> X\u00e1c \u0111\u1ecbnh ph\u1ea7n m\u1ec1m m\u00e1y kh\u00e1ch th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u (v\u00ed d\u1ee5: User-Agent: Mozilla\/5.0<\/code>).
\n\u2013 Ch\u1ea5p nh\u1eadn:<\/strong> Ch\u1ec9 ra c\u00e1c lo\u1ea1i ph\u01b0\u01a1ng ti\u1ec7n \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn cho ph\u1ea3n h\u1ed3i (v\u00ed d\u1ee5: Accept: text\/html<\/code>).
\n\u2013 Lo\u1ea1i n\u1ed9i dung:<\/strong> M\u00f4 t\u1ea3 \u0111\u1ecbnh d\u1ea1ng d\u1eef li\u1ec7u c\u1ee7a n\u1ed9i dung y\u00eau c\u1ea7u (v\u00ed d\u1ee5: Content-Type: application\/json<\/code>).
\n\u2013 Quy\u1ec1n h\u1ea1n:<\/strong> Ch\u1ee9a th\u00f4ng tin x\u00e1c th\u1ef1c \u0111\u1ec3 x\u00e1c th\u1ef1c m\u00e1y kh\u00e1ch (v\u00ed d\u1ee5: Authorization: Bearer <token><\/code>).<\/p>\n

M\u1ed7i ti\u00eau \u0111\u1ec1 \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1ch b\u1eb1ng k\u00fd t\u1ef1 xu\u1ed1ng d\u00f2ng v\u00e0 xu\u1ed1ng d\u00f2ng (\\r\\n<\/code>), v\u00e0 to\u00e0n b\u1ed9 ph\u1ea7n ti\u00eau \u0111\u1ec1 \u0111\u01b0\u1ee3c k\u1ebft th\u00fac b\u1eb1ng hai l\u1ea7n ng\u1eaft d\u00f2ng li\u00ean ti\u1ebfp.<\/p>\n

M\u1ed9t v\u00ed d\u1ee5 c\u01a1 b\u1ea3n: Y\u00eau c\u1ea7u HTTP th\u00f4ng qua Proxy<\/h4>\n

H\u00e3y c\u00f9ng \u0111i s\u00e2u v\u00e0o m\u1ed9t v\u00ed d\u1ee5 c\u01a1 b\u1ea3n \u0111\u1ec3 minh h\u1ecda c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y. H\u00e3y xem x\u00e9t m\u1ed9t m\u00e1y kh\u00e1ch \u0111ang c\u1ed1 g\u1eafng truy c\u1eadp m\u1ed9t trang web th\u00f4ng qua m\u00e1y ch\u1ee7 proxy.<\/p>\n

Y\u00eau c\u1ea7u c\u1ee7a kh\u00e1ch h\u00e0ng:<\/strong><\/p>\n

GET \/index.html HTTP\/1.1\nHost: www.example.com\nUser-Agent: Mozilla\/5.0\nAccept: text\/html\n<\/code><\/pre>\n
S\u1eeda \u0111\u1ed5i Proxy:<\/strong>
\nKhi proxy nh\u1eadn \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u n\u00e0y, n\u00f3 c\u00f3 th\u1ec3 s\u1eeda \u0111\u1ed5i ti\u00eau \u0111\u1ec1 nh\u01b0 sau:
\n\u2013 Th\u00eam th\u00f4ng tin nh\u1eadn d\u1ea1ng c\u1ee7a ri\u00eang m\u00ecnh v\u00e0o X-Forwarded-For<\/code> ti\u00eau \u0111\u1ec1 \u0111\u1ec3 ch\u1ec9 ra IP c\u1ee7a m\u00e1y kh\u00e1ch g\u1ed1c.
\n\u2013 Thay \u0111\u1ed5i User-Agent<\/code> \u0111\u1ec3 che gi\u1ea5u danh t\u00ednh c\u1ee7a kh\u00e1ch h\u00e0ng.<\/p>\n
Y\u00eau c\u1ea7u Proxy \u0111\u00e3 s\u1eeda \u0111\u1ed5i:<\/strong><\/p>\n
GET \/index.html HTTP\/1.1\nHost: www.example.com\nUser-Agent: ProxyServer\/1.0\nX-Forwarded-For: 192.168.1.10\nAccept: text\/html\n<\/code><\/pre>\n
Ph\u1ea3n h\u1ed3i c\u1ee7a m\u00e1y ch\u1ee7:<\/strong>
\nM\u00e1y ch\u1ee7 x\u1eed l\u00fd y\u00eau c\u1ea7u v\u00e0 g\u1eedi l\u1ea1i ph\u1ea3n h\u1ed3i c\u00f3 th\u1ec3 bao g\u1ed3m c\u00e1c ti\u00eau \u0111\u1ec1 sau:<\/p>\n
HTTP\/1.1 200 OK\nContent-Type: text\/html\nContent-Length: 2048\n<\/code><\/pre>\n
Ph\u1ea3n h\u1ed3i c\u1ee7a Proxy cho Kh\u00e1ch h\u00e0ng:<\/strong>
\nSau \u0111\u00f3, proxy chuy\u1ec3n ti\u1ebfp ph\u1ea3n h\u1ed3i \u0111\u1ebfn m\u00e1y kh\u00e1ch, c\u00f3 kh\u1ea3 n\u0103ng th\u00eam ho\u1eb7c s\u1eeda \u0111\u1ed5i ti\u00eau \u0111\u1ec1 m\u1ed9t l\u1ea7n n\u1eefa\u2014c\u00f3 th\u1ec3 th\u00eam h\u01b0\u1edbng d\u1eabn ki\u1ec3m so\u00e1t b\u1ed9 \u0111\u1ec7m.<\/p>\n
Ph\u1ea7n k\u1ebft lu\u1eadn<\/h3>\n
Trong \u0111i\u1ec7u nh\u1ea3y ph\u1ee9c t\u1ea1p c\u1ee7a proxy v\u00e0 header, vi\u1ec7c hi\u1ec3u \u0111\u01b0\u1ee3c s\u1eafc th\u00e1i k\u1ef9 thu\u1eadt c\u1ee7a ch\u00fang l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 ai \u0111i\u1ec1u h\u01b0\u1edbng th\u1ebf gi\u1edbi m\u1ea1ng. Header kh\u00f4ng ch\u1ec9 l\u00e0 th\u00e0nh ph\u1ea7n c\u1ea5u tr\u00fac; ch\u00fang l\u00e0 ng\u01b0\u1eddi \u0111i\u1ec1u ph\u1ed1i giao ti\u1ebfp, h\u01b0\u1edbng d\u1eabn d\u1eef li\u1ec7u qua m\u00ea cung c\u1ee7a Internet. Vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n ch\u00fang b\u1eb1ng proxy m\u1edf ra m\u1ed9t l\u0129nh v\u1ef1c kh\u1ea3 thi, t\u1eeb t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt \u0111\u1ebfn t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t, \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c t\u01b0\u01a1ng t\u00e1c k\u1ef9 thu\u1eadt s\u1ed1 m\u00e0 ch\u00fang ta coi l\u00e0 hi\u1ec3n nhi\u00ean l\u00e0 li\u1ec1n m\u1ea1ch v\u00e0 hi\u1ec7u qu\u1ea3. Gi\u1ed1ng nh\u01b0 m\u1ed9t ngh\u1ec7 s\u0129 c\u1ea9n th\u1eadn l\u1ef1a ch\u1ecdn b\u1ea3ng m\u00e0u c\u1ee7a m\u00ecnh, c\u00e1c chuy\u00ean gia m\u1ea1ng ph\u1ea3i s\u1eed d\u1ee5ng header m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c v\u00e0 c\u00f3 ch\u1ee7 \u0111\u00edch, t\u1ea1o ra nh\u1eefng tr\u1ea3i nghi\u1ec7m c\u1ed9ng h\u01b0\u1edfng tr\u00ean to\u00e0n b\u1ed9 b\u1ed1i c\u1ea3nh k\u1ef9 thu\u1eadt s\u1ed1.<\/p>","protected":false},"excerpt":{"rendered":"
Understanding Headers in Proxy Networks In the vast and intricate landscape of networking, headers play a pivotal role, especially within the context of proxy networks. To grasp their significance, one must first understand what headers are at a technical level. What are Headers? At their core, headers are metadata packets that accompany data packets in […]<\/p>\n","protected":false},"author":3,"featured_media":421,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17],"tags":[137,141,140,138,133,135,136,139,66,134],"class_list":["post-420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-network","tag-accessibility","tag-best-practices","tag-coding","tag-content-structure","tag-headers","tag-html","tag-seo","tag-typography","tag-user-experience","tag-web-design"],"acf":[],"_links":{"self":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts\/420","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/comments?post=420"}],"version-history":[{"count":0,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts\/420\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/media\/421"}],"wp:attachment":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/media?parent=420"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/categories?post=420"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/tags?post=420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}