1
00:00:00,000 --> 00:00:05,950

2
00:00:05,950 --> 00:00:09,310
>> SPEAKER: Ejja nitkellmu dwar ieħor
protocol-- l Trasferiment Hypertext

3
00:00:09,310 --> 00:00:12,060
Protokoll, jew HTTP.

4
00:00:12,060 --> 00:00:15,074
Allura konna tkellimna dwar IP
u TCP fil videos preċedenti.

5
00:00:15,074 --> 00:00:17,240
U dawk huma protokolli
li jiddettaw kif l-informazzjoni

6
00:00:17,240 --> 00:00:20,970
jiċċaqlaq minn magna għall-magni u
minn programm għall-programm jew servizz

7
00:00:20,970 --> 00:00:27,720
għas-servizz permezz tal-internet, permezz
dan in-netwerk ta 'routers u magni.

8
00:00:27,720 --> 00:00:30,640
>> Iżda li ġeneralment ma
l-? kollu istampa, id-dritt

9
00:00:30,640 --> 00:00:33,530
Normalment meta nibagħtu
informazzjoni, il-programm

10
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itself-- meta data hija
riċevuti, jiġifieri, per eżempju,

11
00:00:36,570 --> 00:00:44,270
in email via port TCP 25 jew
page talba internet permezz port 80,

12
00:00:44,270 --> 00:00:48,220
hemm normalment sistema ta 'regoli hemmhekk
biex jipproċessaw dak li stajt biss riċevuti.

13
00:00:48,220 --> 00:00:51,960
U HTTP huwa eżempju
ta 'ftit protokoll bħal dan.

14
00:00:51,960 --> 00:00:54,929
>> HTTP huwa l-uniku
protokoll saff applikazzjoni

15
00:00:54,929 --> 00:00:56,220
li aħna qed tmur biex jitkellmu dwar.

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Iżda huwa sett ieħor
ta 'regoli tiddetta kif

17
00:00:59,660 --> 00:01:02,790
informazzjoni għandha tiġi trasmessa
u pproċessata permezz tal-internet.

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B'mod partikolari, HTTP
tispeċifika eżattament kif

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wieħed għandu jagħmel talba għall-
web page u eżattament kif

20
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server, magna
li tospita paġni tal-web,

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tagħti dik l-informazzjoni
lura lill-klijenti.

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>> Allura dan il-protokoll ma
attwalment jkollhom xejn

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ma 'kif informazzjoni
jiċċaqlaq minn punt A

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il-punt B. Huwa tassew
is-sistema ta 'regoli

25
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for-- huwa bażikament ir-regoli ta '
impenn għal ħidma ma 'web page,

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simili għal meta xi ħadd
mewġ idejn tagħhom fuq int,

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int suppost mewġa lura.

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Li tip ta '
protokoll tal-bniedem konvenzjonali.

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Protokoll HTTP biss jgħid, jekk
inti tixtieq li titlob web

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paġna, kun żgur format jistenna tiegħek
bħal this-- tip ta 'ifformattjar simili

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ittra negozju, per eżempju.

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U r-rispons se simili
jaslu skond dan il-protokoll.

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Hemm oħrajn
protokolli saff applikazzjoni

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li aħna ma tkunx qed tmur biex
jitkellmu dwar fil videos.

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Iżda dawn jinkludu affarijiet simili
Protokoll File Transfer,

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Sempliċi Mail Transfer Protocol għall
jibgħat emails, il Distribuzzjoni Data

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Service, Desktop Remote
Protokoll, PŻR, li

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huwa użat jekk inti tixtieq li remot aċċess
kompjuter tiegħek mill-kompjuter ieħor,

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00:02:05,590 --> 00:02:08,479
XMPP, li ħafna drabi jkun
magħrufa bħala Jabber jew chat,

40
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għalhekk dan huwa l-protokoll
għall-użu chat servizzi.

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U hemm ħafna, ħafna, ħafna oħrajn.

42
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>> Allura kull darba li inti qed tuża
servizz, is-servizz

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qed tistenna informazzjoni
li jiġu received-- talba

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li jkun received-- fil-
format partikolari ħafna

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u huwa meħtieġ li
ritorn informazzjoni lura

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f'format partikolari ħafna ukoll.

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>> Mela ejja jmorru lura għall illustrazzjoni tagħna
minna jixtiequ li tkellem lill-internet.

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Allura aħna kuntenti, u rridu
biex tmur cats.com, id-dritt?

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Allura jekk aħna qed biss jitkellem għall cats.com,
nistgħu ngħid xi ħaġa simili ħej,

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nista 'nara home page tiegħek?

51
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U cats.com se probabbilment
jirrispondu, yeah, żgur.

52
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Hawnhekk inti tmur.

53
00:02:43,440 --> 00:02:46,440
Allura dak tip umana
ta jistaqsu-u-tweġiba.

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>> Xi jfisser li jixbhu fil HTTP?

55
00:02:47,980 --> 00:02:51,340
Ukoll, attwalment it-tip ta jittraduċi
pretty nadif biex xi ħaġa bħal din.

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Aħna jista 'jgħid IKOLLOK / HTTP / 1.1
minn cats.com ospitanti.

57
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Allura bażikament dak li qed nagħmel hawnhekk hija
titlob għall-www.cats.com/ web page.

58
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Aħna normalment iħallu barra l mmejla
illum, iżda li kien biss

59
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ifisser homepage cats.com tal.

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>> Oh, u mill-mod, jien ser
li tkun qed tuża verżjoni HTTP

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1.1 jikkomunikaw miegħek.

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C'est tip ta 'analogi għal
qal, simili, mill-mod,

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Jien ser jitkellem
bil-Franċiż, jew mill-mod,

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Jien ser tkun jitkellem bl-Ingliż.

65
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Li jinsab biss l-format tal-protokoll.

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Huwa wkoll 1.0, li hija
mhux użati komunement aktar.

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Hekk jien HTTP 1.1 taħdit, u
Nixtieq www.cats.com/.

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Jekk jogħġbok tagħmel dan għalija.

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>> U allura hemm informazzjoni oħra,
too-- il-dot, dot, dot hemm,

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li hija informazzjoni dwar
min int hekk cats.com

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tkun taf fejn jibgħatha.

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Iżda dawn huma ż-żewġ
tip ta 'partijiet kritiċi

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fil-bidu nett
ta 'HTTP request--

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bħad meta tibda
ittra you say, għażiż, vojta.

75
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Dan huwa simili ħafna fl-ispirtu għal dan.

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>> U jekk cats.com se
jgħidu, oh, żgur, hawn inti tmur.

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Huma jistgħu jirrispondu bħal
this-- Jien ukoll jirrispondu.

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I wkoll jitkellmu HTTP 1.1.

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It-talba tiegħek hija approvata, 200 OK.

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What int ser
tirċievi hija HTML u mbagħad

81
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dot, dot, dot xi informazzjoni addizzjonali.

82
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U fil-qiegħ nett tal-
talba effettivament hija l-HTML,

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il-lingwa markup, il
kontenut tal-homepage cats.com tal.

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>> Allura HTTP / 1.1-- Nirrikonoxxi tiegħek
talba ġiet aċċettata permezz HTTP 1.1.

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It-talba tiegħek ġiet approvata.

86
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I jistgħu jagħtuk dak li trid, 200 OK.

87
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Int ser tirċievi HTML.

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U allura hawnhekk l-
HTML li inti mitlub.

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>> Imma kultant talbiet tagħna ma
dejjem tmur pjuttost skond il-pjan.

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Nista 'nara paġna cats.html tiegħek?

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00:04:37,100 --> 00:04:40,366
Ukoll, jekk dak li jgħidu, aħna
ma jkollhomx paġna cats.html,

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li jidher tip ta 'realistika
għaliex qed cats.com.

93
00:04:42,740 --> 00:04:44,400
Youd jaħsbu li jkollhom cats.html.

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Iżda OK.

95
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Allura dan huwa tip ta 'l-
interazzjoni tal-bniedem konvenzjonali

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00:04:48,484 --> 00:04:49,650
aħna issa kellna ma cats.com.

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00:04:49,650 --> 00:04:51,060
Kif ma li jittraduċu?

98
00:04:51,060 --> 00:04:52,726
>> Dan jista 'jkun xi ħaġa familjari għalik.

99
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Talba tagħna ħares eżattament l-istess,
ħlief minflok jkollna slash

100
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aħna qed issa jkollna cats.html.

101
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Allura issa dak bażikament dan kollu
talba huwa qal huwa jogħġbok agħtini

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www.cats.com/cats.html.

103
00:05:05,620 --> 00:05:08,700
Allura l-ospitanti u-nofs
parti minn dik il-linja ta 'fuq

104
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jindika hemm preċiżament
dak il-paġna I am titlob għal.

105
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Iżda cats.com f'dan il-każ mhux se
li tkun tista 'tirrispondi b'mod pożittiv.

106
00:05:17,590 --> 00:05:19,089
Huma ma jafux aħna qed jitkellem dwar.

107
00:05:19,089 --> 00:05:25,170
U għalhekk din hija xi ħaġa li jista 'jkollok
tidher HTTP before-- 1.1 404 Mhux Found.

108
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I ma setgħetx issib dak
inti kienu jitolbu għal.

109
00:05:27,180 --> 00:05:30,460
Mill-mod, jien ser jagħtuk
lura xi HTML, u ġeneralment li HTML

110
00:05:30,460 --> 00:05:32,351
huwa l-kontenut ta 'xi 404 paġna.

111
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U fil-każ ta '
cats.com, huwa probabbilment

112
00:05:34,100 --> 00:05:37,720
xi qtates ħelu fil-basket ma '
a diqa 404 wiċċ jmiss lilhom,

113
00:05:37,720 --> 00:05:40,920
għax int se tkun
diqa meta inti ma tieħux paġna

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li inti kienu qed ifittxu.

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>> Dik hija tip ta 'l-baŜi ta' dak li
protokoll, il-protokoll HTTP talbiet

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00:05:48,520 --> 00:05:49,180
look like.

117
00:05:49,180 --> 00:05:52,640
Huma qed verament simili għal kif aħna
se jagħmel interazzjoni simili

118
00:05:52,640 --> 00:05:55,460
f'konvenzjonijiet biss bniedem
titlob xi ħaġa

119
00:05:55,460 --> 00:05:58,250
u jkollna lura jew kitba ta '
ittra u jistennew rispons

120
00:05:58,250 --> 00:06:00,380
ittra f'format partikolari.

121
00:06:00,380 --> 00:06:03,910
Dan huwa pretty ħafna dak
HTTP huwa biss canonicalizing

122
00:06:03,910 --> 00:06:10,190
għall-mezzi kollha li jkunu jixtiequ aċċess
paġni tal-web, trasferimenti Portugues.

123
00:06:10,190 --> 00:06:15,110
>> Allura linja tal-formola, dan il-
Metodu verżjoni talba HTTP fil-mira,

124
00:06:15,110 --> 00:06:17,100
jissejjaħ linja talba HTTP.

125
00:06:17,100 --> 00:06:23,740
Huwa ġeneralment l-ewwel ħaġa li hija
trasmessa bħala parti minn talba HTTP

126
00:06:23,740 --> 00:06:26,180
jew jekk inti qed tistaqsi għal HTTP.

127
00:06:26,180 --> 00:06:29,970
Huwa tip ta 'bħal, kif għidt, qal
qalb, vojt fil-quċċata ittra tiegħek.

128
00:06:29,970 --> 00:06:32,880
Huma jafu li int
kitba minnhom ittra.

129
00:06:32,880 --> 00:06:34,796
Allura dan huwa simili ħafna
li qal, I know

130
00:06:34,796 --> 00:06:37,670
li dawn qed jagħmlu talba HTTP
u dan huwa l-format partikolari

131
00:06:37,670 --> 00:06:39,090
dawn qed titlob għall.

132
00:06:39,090 --> 00:06:43,810
>> Verżjoni HTTP huwa probabbilment
dejjem se jkunu HTTP / 1/1.

133
00:06:43,810 --> 00:06:46,670
1.0 Jeżisti wkoll iżda mhux
verament użati aktar.

134
00:06:46,670 --> 00:06:49,200
Għal finijiet ta 'CS50,
IKOLLOK huwa probabbilment dejjem

135
00:06:49,200 --> 00:06:51,540
dak li int ser tkun
użu meta int fil-fatt

136
00:06:51,540 --> 00:06:54,250
jagħmlu talbiet HTTP diretti.

137
00:06:54,250 --> 00:06:57,720
Iżda POST hija għażla oħra li aħna qed
mhux ser jitkellmu dwar id-dritt issa.

138
00:06:57,720 --> 00:07:02,980
U mbagħad talba immirati hija
dak il-paġna fuq server tal-korp ospitanti

139
00:07:02,980 --> 00:07:05,812
inti tixtieq li tikseb.

140
00:07:05,812 --> 00:07:08,020
As I said, dak l-isem ospitanti
hija linja separata, normalment

141
00:07:08,020 --> 00:07:10,350
it-tieni linja tat-talba globali.

142
00:07:10,350 --> 00:07:13,660
U għalhekk meħuda flimkien, l-ospitanti
isem u l-mira talba

143
00:07:13,660 --> 00:07:16,070
tispeċifika speċifiku
riżorsa li qed jiġi mfittex.

144
00:07:16,070 --> 00:07:20,986
Fl-eżempju tagħna 404-tieni ilu, I
kienet qed titlob għal darb'oħra għal www.cats.com,

145
00:07:20,986 --> 00:07:22,940
cats.com huwa l-ospitanti.

146
00:07:22,940 --> 00:07:26,300
U fit-talba linja tiegħi,
I qal /cats.html.

147
00:07:26,300 --> 00:07:27,790
Dan kien fil-mira t-talba tiegħi.

148
00:07:27,790 --> 00:07:31,200
So ġenerali I kienet qed titlob għall-
kontenut jew il-riżorsa tinsab

149
00:07:31,200 --> 00:07:36,410
fil www.cats.com/cats.html.

150
00:07:36,410 --> 00:07:38,870
>> U mbagħad ibbażata fuq jekk
teżisti l riżorsa

151
00:07:38,870 --> 00:07:42,160
u jekk il-server jista 'jagħti
ir-riżorsa skond il-klijent tal

152
00:07:42,160 --> 00:07:46,760
talba, inti tista 'tikseb
diversi kodiċijiet ta 'stat lura.

153
00:07:46,760 --> 00:07:50,280
Xi wħud minn dawn il-kodiċijiet ta 'status inti stajt tidher
għaliex qed parti mir-rispons.

154
00:07:50,280 --> 00:07:53,580
Xi wħud minnhom, 200 OK, huma
probabbilment pretty siekta.

155
00:07:53,580 --> 00:07:55,650
You ħadthom probabbilment qatt
paġna jirrispondu 200 OK.

156
00:07:55,650 --> 00:07:56,890
Inti biss tikseb il-paġna.

157
00:07:56,890 --> 00:08:01,260
Mhuwiex simili żball 404,
li normalment pjuttost ċar.

158
00:08:01,260 --> 00:08:03,850
Inti normalment tara li jgħid 404.

159
00:08:03,850 --> 00:08:06,880
>> Mela ejja nitkellmu dwar dak li xi wħud
ta 'dawk kodiċijiet ta' stat jista 'jkun.

160
00:08:06,880 --> 00:08:09,660
Għal darb'oħra, meta l-server
jirrispondi lilna, dawn qed

161
00:08:09,660 --> 00:08:12,120
ser jirrispondu istatus verżjoni HTTP.

162
00:08:12,120 --> 00:08:14,020
Normalment HTTP / 1.1.

163
00:08:14,020 --> 00:08:17,410
Liema huma dawn il-kodiċijiet ta 'status ser ikunu?

164
00:08:17,410 --> 00:08:18,890
Well, nistgħu jiksbu suċċess.

165
00:08:18,890 --> 00:08:23,617
Allura fil-kategorija suċċess, aħna
tista 'tikseb kodiċi 200 ma' l-OK test.

166
00:08:23,617 --> 00:08:24,450
Xi jfisser dan?

167
00:08:24,450 --> 00:08:25,491
Well, kollox huwa tajjeb.

168
00:08:25,491 --> 00:08:26,721
Inti għamilt talba valida.

169
00:08:26,721 --> 00:08:27,720
Hawn tweġiba valida.

170
00:08:27,720 --> 00:08:30,060
I kien kapaċi jagħti
eżattament dak li riedu.

171
00:08:30,060 --> 00:08:33,080
>> Kultant inti tista 'tikseb affarijiet oħra
li inti mhux se Avviż dritt bogħod

172
00:08:33,080 --> 00:08:35,140
iżda huma kemmxejn fallimenti.

173
00:08:35,140 --> 00:08:36,422
Huma qed imsejħa redirections.

174
00:08:36,422 --> 00:08:37,630
Hemm żewġ dawk komuni hawn.

175
00:08:37,630 --> 00:08:41,520
301 Permanently-- Ittrasferit
dak li dan bażikament ifisser

176
00:08:41,520 --> 00:08:43,559
hija l-paġna hija issa f'post ġdid.

177
00:08:43,559 --> 00:08:44,920
Hija se jgħixu hemmhekk għal dejjem.

178
00:08:44,920 --> 00:08:47,150
U ħafna browsers se
awtomatikament tieħu direzzjoni ġdida.

179
00:08:47,150 --> 00:08:49,860
Sabiex tkun taf qatt verament tara
301, jew, sakemm int

180
00:08:49,860 --> 00:08:52,210
użu ta 'verament out-of-data
browser, possibilment,

181
00:08:52,210 --> 00:08:57,660
minħabba r-rispons 301 huwa parti mill
l-dot, dot, dot tar-rispons 301.

182
00:08:57,660 --> 00:08:59,577
Hija wkoll jgħidlek fejn il-paġna ġdida hu.

183
00:08:59,577 --> 00:09:01,660
U hekk browsers aktar se
biss tieħu direzzjoni ġdida hemmhekk,

184
00:09:01,660 --> 00:09:03,570
jekk wieħed jassumi li inti tixtieq li tmur hemmhekk.

185
00:09:03,570 --> 00:09:05,440
>> Kultant inti ser tirċievi wkoll 302 misjuba.

186
00:09:05,440 --> 00:09:07,850
U dan wieħed inti fil-fatt
xorta tista 'tara kultant.

187
00:09:07,850 --> 00:09:09,720
Kultant paġni jiċċaqalqu temporanjament.

188
00:09:09,720 --> 00:09:13,570
Allura huwa mhux se jkunu mibnija fil
talba javżak il-browser

189
00:09:13,570 --> 00:09:16,740
li tbiddel b'mod permanenti kwalunkwe ħin
jara t-talba li inti

190
00:09:16,740 --> 00:09:18,255
tagħmel lill-bidla li xi ħaġa oħra.

191
00:09:18,255 --> 00:09:21,210
Allura inti tista 'tara 302
Misjuba, li bażikament

192
00:09:21,210 --> 00:09:22,710
jgħid din il-paġna jgħix x'imkien ieħor.

193
00:09:22,710 --> 00:09:24,418
Iżda dan mhuwiex ser
jgħixu hemmhekk għal dejjem.

194
00:09:24,418 --> 00:09:29,052
Hija eventwalment se probabbilment jmorru
lura lejn fejn inti taħseb li hu.

195
00:09:29,052 --> 00:09:31,780
>> Imbagħad int ser tingħata affarijiet
bħal żbalji klijent.

196
00:09:31,780 --> 00:09:34,012
Allura dawn huma dawk li inti stajt
probabbilment jidhru, issa.

197
00:09:34,012 --> 00:09:35,970
Inti probabilment ma bbenefikawx
l 200s jew il-300s,

198
00:09:35,970 --> 00:09:37,370
imma int probabilment
familjari mal-400s.

199
00:09:37,370 --> 00:09:40,130
U dan huwa dak li aħna ser nitkellmu
dwar fit-tieni, 500s kif ukoll.

200
00:09:40,130 --> 00:09:42,580
>> Inti tista 'tara 401 mhux awtorizzat.

201
00:09:42,580 --> 00:09:45,100
Normalment dan ifisser li int
jippruvaw jiksbu aċċess għas paġna,

202
00:09:45,100 --> 00:09:46,230
imma int ma illoggjat.

203
00:09:46,230 --> 00:09:50,500
Allura inti tipprova u tmur għal xi
profil jew xi ħaġa fuq Facebook

204
00:09:50,500 --> 00:09:53,106
jew inti tipprova u l-aċċess
some-- int fuq ix-xogħol.

205
00:09:53,106 --> 00:09:56,619
Inti qed jippruvaw jiksbu aċċess għas xi ħaġa
fuq l-internet xogħol tiegħek,

206
00:09:56,619 --> 00:09:57,660
imma int mhux illoggjat.

207
00:09:57,660 --> 00:09:58,740
Inti ma tistax tara l-paġna.

208
00:09:58,740 --> 00:10:01,770
Inti tista 'tikseb 401 mhux awtorizzat,
li jfisser li għandna probabbilment

209
00:10:01,770 --> 00:10:06,590
se jkunu jistgħu jissodisfaw din it-talba,
iżda l-ewwel għandek bżonn log in to jagħmlu dan.

210
00:10:06,590 --> 00:10:09,590
>> Bil-maqlub, inti tista 'tikseb 403
Projbit, li huwa ma verament

211
00:10:09,590 --> 00:10:11,490
jimpurtax jekk int illoggjat jew le.

212
00:10:11,490 --> 00:10:13,020
Din it-talba mhuwiex permess.

213
00:10:13,020 --> 00:10:15,320
Teżisti Ir-riżorsa fuq is-server.

214
00:10:15,320 --> 00:10:17,817
Imma m'intix permess li jkollhom aċċess għaliha.

215
00:10:17,817 --> 00:10:20,900
Dan huwa files normalment interni li
jgħixu fuq is-server għal diversi raġunijiet

216
00:10:20,900 --> 00:10:23,860
iżda mhux maħsuba li tkun
aċċessata mid-dinja ta 'barra,

217
00:10:23,860 --> 00:10:25,030
u għalhekk huma pprojbiti.

218
00:10:25,030 --> 00:10:27,120
Huma jgħixu hemmhekk.

219
00:10:27,120 --> 00:10:28,440
Jien ma tgħid I ma tistax issib lilha.

220
00:10:28,440 --> 00:10:30,030
Imma jien tgħid I ma tistax jagħtiha lilek.

221
00:10:30,030 --> 00:10:32,071
U ma jimpurtax jekk
int illoggjat jew le.

222
00:10:32,071 --> 00:10:35,479
U mbagħad naturalment, il-
komuni ħafna 404 Not Found.

223
00:10:35,479 --> 00:10:37,020
Il-fajl ma teżistix fuq is-server.

224
00:10:37,020 --> 00:10:40,200
Nixtieq li tissodisfa
talba tiegħek, imma ma nistax.

225
00:10:40,200 --> 00:10:43,390
>> Inti wkoll kultant tara server
żbalji, l-aktar komuni ġeneralment

226
00:10:43,390 --> 00:10:46,990
tkun 500 Error Server Intern, li
fatt ma jgħidlek xejn

227
00:10:46,990 --> 00:10:50,200
fil-livelli kollha dwar dak li marret ħażin.

228
00:10:50,200 --> 00:10:53,290
Imma din mhix attwalment inti tagħmel
żball fit-talba tiegħek.

229
00:10:53,290 --> 00:10:58,200
Huwa fil-fatt l-server jonqos
li jagħti fuq it-talba b'xi.

230
00:10:58,200 --> 00:11:00,040
Allura 500 hija r-reazzjoni ġenerali.

231
00:11:00,040 --> 00:11:03,190
>> Int ser ikollok tara wkoll xi ħaġa
bħal Service mhux disponibbli,

232
00:11:03,190 --> 00:11:05,720
li nemmen li huwa kodiċi 503.

233
00:11:05,720 --> 00:11:07,882
U Timeout-- Gateway jekk
Qatt kien paġna biss

234
00:11:07,882 --> 00:11:09,590
joqogħdu hemm tagħbija u
tagħbija u t-tagħbija

235
00:11:09,590 --> 00:11:12,715
u int qatt ma tkun taf jekk li għaddej biex
tagħbija u mbagħad eventwalment hija biss says--

236
00:11:12,715 --> 00:11:13,650
biss tagħti up.

237
00:11:13,650 --> 00:11:15,460
Li l-504 Gateway Timeout.

238
00:11:15,460 --> 00:11:17,600
Il-server riedu
tesegwixxi t-talba tiegħek,

239
00:11:17,600 --> 00:11:19,930
imma xi ħaġa li marret ħażin
fuq il side-- server

240
00:11:19,930 --> 00:11:24,452
mhux fuq side-- tiegħek biex
jikkawża li tkun problema.

241
00:11:24,452 --> 00:11:27,410
Issa, aħna jista 'jispiċċa l-istorja hawn,
imma dak li jien fil-fatt se tagħmel issa

242
00:11:27,410 --> 00:11:29,368
huwa Jien ser jiftħu
browser tiegħi u jurik

243
00:11:29,368 --> 00:11:32,250
kif inti tista 'tkun kapaċi li tara
xi wħud minn dawn il-kodiċijiet ta 'status

244
00:11:32,250 --> 00:11:34,580
anki jekk inti ma ġeneralment tara minnhom.

245
00:11:34,580 --> 00:11:39,090
U aħna qed tmur biex tagħmel dan billi tieħu
ħarsa lejn xi għodod iżviluppatur.

246
00:11:39,090 --> 00:11:42,050
>> Kull dritt So here I am
issa tieqa browser tiegħi.

247
00:11:42,050 --> 00:11:45,840
U nixtieq li jitgħallmu ftit ftit
aktar dwar dawn it-talbiet HTTP.

248
00:11:45,840 --> 00:11:49,060
Kif nista know-- ċertament nafu jekk
paġna goes-- meta xi ħaġa tmur ħażin,

249
00:11:49,060 --> 00:11:49,630
irridu jiksbu 404.

250
00:11:49,630 --> 00:11:50,465
Imxejna kollha raw dan.

251
00:11:50,465 --> 00:11:51,840
Aħna ma bżonn biex juru dan.

252
00:11:51,840 --> 00:11:53,048
Imma liema huma xi oħrajn?

253
00:11:53,048 --> 00:11:56,850
U kif se naraw
dawn it-talbiet fl-azzjoni?

254
00:11:56,850 --> 00:11:59,990
>> Allura l-ewwel ħaġa jien ser
tagħmel huwa tiftaħ Developer Tools.

255
00:11:59,990 --> 00:12:02,580
Allura Developer Tools huma mibnija
fis browsers aktar moderni

256
00:12:02,580 --> 00:12:06,020
u inessu biex tara l-affarijiet
li aħna ma altrimenti

257
00:12:06,020 --> 00:12:10,580
see-- xi tip ta 'informazzjoni addizzjonali ta'
qed jiġi trasmess taħt web tagħna

258
00:12:10,580 --> 00:12:11,500
talbiet.

259
00:12:11,500 --> 00:12:12,790
Jien jużaw Google Chrome hawn.

260
00:12:12,790 --> 00:12:16,900
U biex tiftaħ Developer Tools
fil Chrome, inti biss hit F-12,

261
00:12:16,900 --> 00:12:18,729
u li għaddej biex tiftaħ
it up fuq il-ġenb.

262
00:12:18,729 --> 00:12:21,770
Ladarba I tip-talba, I ser zoom in
hekk nistgħu naraw x'inhu għaddej hawn.

263
00:12:21,770 --> 00:12:28,530
Imma dak li jien ser tagħmel fil-browser tiegħi
bar is-- u jien ser zoom fl fuq here--

264
00:12:28,530 --> 00:12:32,427
I se tagħmel talba lill www.google.com.

265
00:12:32,427 --> 00:12:34,260
Imxejna kollha probabbilment magħmula
din it-talba qabel.

266
00:12:34,260 --> 00:12:35,400
Jien ser hit Ikteb.

267
00:12:35,400 --> 00:12:41,920

268
00:12:41,920 --> 00:12:46,400
>> Issa, minn hawn fil Developer tiegħi
Għodod, stajt għażlu l-tab Network.

269
00:12:46,400 --> 00:12:48,010
U tinnota ħafna affarijiet hawn.

270
00:12:48,010 --> 00:12:51,732
Ħares lejn these-- 200 OK, OK 200, xi
ta 'dawn il-kodiċijiet ta' status ġejjin up.

271
00:12:51,732 --> 00:12:53,356
I do not know għaliex jien jkollna 302 tinsab.

272
00:12:53,356 --> 00:12:54,860
I ma jirrealizzaw I d tara li wieħed.

273
00:12:54,860 --> 00:12:58,192
Imma bażikament avviż li pretty
ħafna, f'termini ta 'request-- Google tiegħi

274
00:12:58,192 --> 00:13:00,150
I għamel sempliċi ħafna
talba għal paġna Google.

275
00:13:00,150 --> 00:13:02,890
U fil-proċess ta '
twassil talba tiegħi,

276
00:13:02,890 --> 00:13:05,670
Google apparentement għamlu ħafna
ta 'talbiet oħra f'isem tiegħi.

277
00:13:05,670 --> 00:13:11,990
>> Imma stajt għamel talba nikseb għal Google
paġna u jien jkollna ħafna ta '200 OKs.

278
00:13:11,990 --> 00:13:14,830
Jien ma tara 200 OK fuq
screen tiegħi, imma jien jkollna

279
00:13:14,830 --> 00:13:17,170
ħafna talbiet li saru.

280
00:13:17,170 --> 00:13:19,550
Wieħed aktar li jien pretty
żgur ikun sejjer jaħdem

281
00:13:19,550 --> 00:13:21,920
is-- għal dawk minnkom li
huma verament qodma l-iskola,

282
00:13:21,920 --> 00:13:26,012
inti tista 'taf li Facebook kienet
mhux dejjem fil Facebook.com.

283
00:13:26,012 --> 00:13:29,780
Fil-bidu tagħha kien
fil wwww.thefacebook.com.

284
00:13:29,780 --> 00:13:33,560
Huma apparentement ma setgħux jiksbu aċċess
li Facebook.com għal pjuttost awhile.

285
00:13:33,560 --> 00:13:35,870
>> U hekk dak li jien jistennew
hawnhekk huwa li tinkiseb informazzjoni.

286
00:13:35,870 --> 00:13:37,315
U aħna ser tara jekk dan borom.

287
00:13:37,315 --> 00:13:39,190
Dak li jien jistennew hawn
huwa li tinkiseb informazzjoni

288
00:13:39,190 --> 00:13:43,980
li Facebook mxiet b'mod permanenti
minn thefacebook.com għall Facebook.com.

289
00:13:43,980 --> 00:13:46,830
Hekk jien jistennew x'imkien
qrib il-quċċata ta 'talbiet tiegħi

290
00:13:46,830 --> 00:13:50,730
fuq fil Developer Tools tiegħi
tikseb notifika 301

291
00:13:50,730 --> 00:13:52,580
li Facebook mxiet b'mod permanenti.

292
00:13:52,580 --> 00:13:59,070
Għal darb'oħra, jien mhux se tara 301
fuq l-iskrin browser tiegħi.

293
00:13:59,070 --> 00:14:01,380
U għaliex dan huwa 301,
huwa pass permanenti.

294
00:14:01,380 --> 00:14:03,500
Browser tiegħi, hija li
huwa browser moderna,

295
00:14:03,500 --> 00:14:06,110
huwa probabbilment se idawwru
me Facebook.com xorta waħda.

296
00:14:06,110 --> 00:14:07,260
Imma ejja ara dak li jiġri.

297
00:14:07,260 --> 00:14:09,340
>> U issa jien se
mur thefacebook.com.

298
00:14:09,340 --> 00:14:11,370
U Yep, hemm hu dritt fil-quċċata.

299
00:14:11,370 --> 00:14:13,390
Hija marret bogħod, imma kien hemm.

300
00:14:13,390 --> 00:14:14,820
Let me iscroll up here.

301
00:14:14,820 --> 00:14:18,004

302
00:14:18,004 --> 00:14:18,920
Dritt hawn fil-quċċata.

303
00:14:18,920 --> 00:14:23,080
I għamel talba għal thefacebook.com,
u jien jkollna rispons

304
00:14:23,080 --> 00:14:25,410
li din il-paġna mxiet b'mod permanenti.

305
00:14:25,410 --> 00:14:27,770
U allura hawnhekk hija 307
l idawwru intern.

306
00:14:27,770 --> 00:14:30,680
U għalhekk dan huwa dak li attwalment
mċaqalqa me lill-aktar

307
00:14:30,680 --> 00:14:33,330
www.facebook.com familjari.

308
00:14:33,330 --> 00:14:38,480
>> Allura dawn il-kodiċijiet ta 'rispons tagħmel xorta
jiġri, anke jekk aħna ma tara minnhom.

309
00:14:38,480 --> 00:14:40,710
Jien ma jmur biex
juru 401, 403, 404,

310
00:14:40,710 --> 00:14:43,090
għaliex inti ħadthom probabbilment jidhru
dawk fil-punti varji.

311
00:14:43,090 --> 00:14:45,740
U 500, inkun biss
tip of-- aħna'd jiksbu xxurtjati

312
00:14:45,740 --> 00:14:50,380
jekk ltqajna 500 għaliex ma nafux liema
servers huma attwalment imnaqqsa kullimkien.

313
00:14:50,380 --> 00:14:53,060
Iżda dawn il-kodiċijiet ma
jeżistu, u hemm mod

314
00:14:53,060 --> 00:14:58,610
jkollhom aċċess għalihom anke jekk aħna ma
tarahom firsthand fuq is-sistemi tagħna.

315
00:14:58,610 --> 00:14:59,530
Jien Doug Lloyd.

316
00:14:59,530 --> 00:15:01,570
Dan huwa CS50.

317
00:15:01,570 --> 00:15:03,557