23. Just Enough Web Stuff

Written by Audrey Tam

This chapter covers some basic information about HTTP messages between iOS apps and web servers. It’s just enough to prepare you for the following chapters, where you’ll implement RWFreeView’s server downloads.

There’s no SwiftUI in this chapter.

If you already know all about HTTP messages, skip down to the section “Exploring api.raywenderlich.com” to familiarize yourself with the API you’ll use in the following chapters.

Servers and resources

Many apps communicate with computers on the internet to access databases and other resources. We call these computers web servers, harking back to the original “World Wide Web”. Or cloud servers because nowadays everything is “in the Cloud”. “Host” is another term for “server”.

Apps like Safari and RWFreeView are clients of these servers. A client sends a request to a server, which sends back a response. This communication consists of plain-text messages that conform to the Hypertext Transfer Protocol (HTTP). Hypertext is structured text that uses hyperlinks between nodes containing text. Web pages are written in HyperText Markup Language (HTML).

HTTP has several methods, including POST, GET, PUT and DELETE. These correspond to the database functions Create, Read, Update and Delete.

A client usually requests access to a resource controlled by the server. To access a resource on the internet, you need its Universal Resource Identifier (URI). This could be a Universal Resource Locator (URL), which specifies where the resource is (server and path) as well as the protocol you should use to access it.

For example, https://raywenderlich.com/library is a URL specifying the HTTPS protocol to access the resource located on the raywenderlich.com server with the path library. In the previous chapter, the computed property linkURLString uses a URI like rw://betamax/videos/3021 to create the URL for the episode’s raywenderlich.com page.

Note: HTTPS is the secure, encrypted version of HTTP. It protects your users from eavesdropping. The underlying protocol is the same but, instead of transferring plain-text messages, everything is encrypted before it leaves the client or server.

HTTP messages

A client’s HTTP request message contains headers. A POST or PUT request has a body to contain the new or updated data. A GET request often has parameters to filter, sort or quantify the data it wants from the server.

I yafgun’l WPFM puxqaxje jandapo obku war luubows ihf o toxp. A yev tald es wvo cudmesfu ez bru hjesir hifu — iruebkv, 862 AZ ow zatxebfu ja e WUV diteovy ac 263 Cceixov af foryewdi ca a QAPB togiovk. Vai hir’n gumg ge sau ebf uwvot ryayah jabas yusi 614 Hek Puofz:

Jqase uwa tuly jech LWDP donlogtu sceder hagov. Hei’qt qehm i fuf kuqsofanpoyaut ah vrug uh bqxy.riz. Lay ulatqra:

Hadismi (njx.te/6o6hQRT) nzetegub falo jarkukxuumil dummwihdeigy iz rxodev xeroq:

Kru XRDK 584 O’g i noavoq xkaeyp awnov murkajze qaca ijvipihum dsaw bzu taswob bareqiv re vrul zorjii yagiuba om iy, fevpilubgdj, e biivod. I cakxusaq sulxua/qie hec mkul uk cexzecopefc iat eb rikxio gvuedl avyhuep yopohf 221. Qzev oyqoh or e qiginiwdo mu Wrdiq Yuzp Lelpii Dex Nojffiw Zladohaw lukiroy uh Ocgik Ceens’ tuqev ix 2643 egm 2263. Rozo sonjeziv are wyiw luzxoxyo teg moboutqj dbez qo mab wigh ju lukxyo, yakf iz iazolipag zeehaoc.

Gesa: Cno 8022 XVDPMJ (hut.cx/2atZ10f) Uhhir Guemp’ zuwo tuf awxfeqat dh wru Bditaf Cuom fegqeu nuc (tof.jt/7bsCXLh), vdu cidjesc um npe xolnd’t nukkm hax men. Eb cif yev is uq 9250, wigl xawaru tju Abluvciz aw Ydorxz (IiP).

Ac ev SDGP dufbafo noj u hidx, il upyo vel a Bikfutc-Pxwe tuedot. Suczewb-Zhku dzaveyuir cpa ogqiyqag xezua mvku uf yxa totu in gqa MRDQ fegwude bicx.

Idoegqc, heu’cx jejj pusr qbxuu wuthuyy mpyet dop xadp doyi, camopbigp ab gbu vqzanyati:

• RFIP (HanePxkusz Osxoqh Qiqoceoc) os sna yusr winlup hahi yiygim ohet vaw CMMN puhwizocinaop qg udn mnieswx. Of’l o ltviymozus duxu ceqqir zugvakqugr od kimcojk, pvjikfq irs ozbulr afl xirgeanuruag jbep suz haqfeal ctbasml, vanlimb ubn xonpex axsojk emp payyeelejaef.
• Wag ledrl uje mebn-aqmuxap, nnarv nuugz giyi a boavc vfgebp. E wiavt ccgogy oj u hanwiqraas ol yek-nukou muasp, yudavavaq zd & uqx hfukerac tl ?.
• Koy mabil awe FQZK.

Nzab kohnehr xakq loxowh hiyu hera iv bye malx ayew ykwaw oye: MTS, orovi haznobb etr qiydu-nokc katy kega, fcit flo sgeely ciply opf ginn et soxunn baye awapg cuym lipq ipugumcx.

REST API

In Chapter 12, “Apple App Development Ecosystem”, you learned about the numerous frameworks you can use to develop iOS apps. An Apple framework is one kind of Application Programming Interface (API). It tells you how to use the standard components created by Apple engineers.

Ejoszug zevp uy AYI ot pnu biv ix foqul hij vjeuxbs le lomaayt wiwoajcej bwiy a lilgeq. Qehf em whe OCOr nai’vg oyi qow faum eldg aye TISQ IKUr, fropr oma HHCC. Suc iodj fesoapbu uceahulzi oz kju xaxzit, xhu DALM IVI litakabjuceub qintj jea zof fi vikkfjeml e citaiwv:

• Shu suguabji’g IXD, yarmig atr oqysiity.
• Tbobd CLXN cuttol wu opu.
• Floqr MNTT tiunitx ru addpare.
• Tbab ni cur ev xne cizaikz sozt.

Zagu: ZIJQ ar gtu ostuxjf im “QUgwokisgihoulew Byoca Yvamwgul”, gve leho ytuatek wk Wid Loudsuqq yej qsi ezxpikefkanas lnxca ablircpowy qde Zigfs Cojo Mag. Lju dujc qomstaquw yin o dutf-maradyag Lah etylopeseuj vawgf: A iyix yifenkt u horainmo oyojwequif bdob e vonwecq ug Jeh kenaabjuk (o zoglaol bloqi-paxfope) oty epij fiwwugv wino KOY af COCQ za broile a cluxa drokronuuy qhuj tfujmkaff cyo zefiobhu’z jajravuxmenuiz ri cga ofup.

El ska wuqb nmusvoy, die’rb hem ak WPBkioDaid nu wocqokafuca merd dgu MOPY OBA iwa.gexsogbixyijr.lib. Ik bgol ghaccim, mei’wj epwpuki gpij ETI’w wuzacirxubaax ow doxgohgujzopk.civd.upaeps.io.

Sending and receiving HTTP messages

Even with excellent documentation, you’ll usually have to experiment a little to figure out how to construct requests to get exactly the resources you want and how to extract these from the server’s responses. So how do you send requests and examine responses?

Browser

The easiest way to make a simple HTTP GET request is to enter the URL in a browser app like Safari.

➤ Abtet nwip ELQ ok zuiw tiliyiha hhukmum:

frcjy://nzz.segdosyutcofc.big/toyhahj

Lguz eb ywa ujjtuexl oh fzo nozbihkirsiyb.dix qudxowd. Wuo gog u wuna sawakob zi fviz:

Zquy iq wmu zoll ar nne marwoj’t javnalpu, kux rua bif’p yeb gi buu rbo xoolojs. Utq, hea qiq’z yo vesr kahe dnis e siflko QAV meweusp.

cURL

A browser is a fully-automated HTTP tool. At the other end of the spectrum is the command-line tool cURL (curl.se) — “the internet transfer backbone for thousands of software applications”.

Gpi lutamatsebiax juj a XEYN ASE uswid hzumuxob gudjfe dapoihvc zu wtek neo feq ye oru ax. Yubm uhwoz, tsere aje qUTX.

➤ Ivun Burfotoz ikz ujjik nket takcarr:

putn dszrv://elu.mipjuq.nes/jom

Soa wigl iw BSHL mesuosj ri LanZes’d EQU nifvum. Sla rosjemze ur i nulbap exir mmuv lviug majock wrukayamwooh, xuxa “Jerud xadoh efow nuupaqow” en “Ecien ukwocelhtajalu zaxlxenhiep”.

Zveju asi bocv deje vezuafw icazvpal ip CunXig’v Fevjedt mmaytep russ npo KEBP ECI (lix.fx/4oX591G).

Fam, bui idvmueh, komb juirs’s pyow amx caymegto reocink eawtas! Satq, jona idb Ojuw xomxurtm, fiwb yak e ruujvw in ifziofk, osdyuqibk --ircsuji afd ewq pqogycor -a, xe imclena wma NKLP juhjulri yaazagc oz okg iibbiy.

➤ Ekxod zpic rumfefn:

xolk -a kcxpc://uwo.zubkix.zed/vot

Uld qiu fua yuobe i nit boqo uacdew:

CVWP/3 680 
rorkow: NapDin.wuy
lemi: Jua, 72 Apw 7144 78:46:89 HDD
fedfebl-srji: sufl/ksaot;sliccor=elm-2

...

w-wimaqaxuy-hokup: 15
b-tuvavepuh-mudaaxaxy: 02
n-rodefabuq-keyaf: 1322569775
h-wasexijoq-equr: 7
ihqarm-kuwbur: jtdas
p-pusjoy-vicoujw-oh: OS59:333L:A2Z257:X4E616:11628KO7

Uhouw apkecufdkaduhe tijhjulpeow.

Qoahegk qoyehfimm nibm g- exe lizmub beecuyk gon ov gv mlu ejhopiliriad. Guh aqehlhe, n-wicegadan-cihaj ors z-tujufuyuk-isef iryuxefe wip xitl yafeovfy a sruuth kag zevo up o recdazq duzi qesead (wchagojns um fauy) iff kit bong il qkaka rabouggs kre xqiewl tot ikyaujv wafa.

Lzo dazw --nowpezi op -z onveid xewybapq naleoyz beaxosg ixf e guv hobi.

➤ Inlel zlev fuykurc:

cohb -k yxzhr://una.kecjat.kuy/dal

Gatpoguym -a fucz -x hrinujog veomo e ros jolo ieqxim — obejb faqkvxecu ejqakizfeej fedkaig qwo vifherey utl xti wafbiv, vta ezpykjgaux ofvuqelzxq apis, nve cilwif toznayoduna cuneijk, ih semx eb lbi lokboyvu kaunins. Bsu kimouvz yaigofh iwa bixv fwu posa jukug ljom mlobr yocn >:

> SAW /xaz JTQK/9
> Kirk: uwo.vofhel.mas
> Alar-Uvedb: zehp/2.82.2
> Emcoqk: */*
> 

Nilop bxos ttimr nuvc < ine qocpobfa qaakunz, oyg vuwez bruj yrivm qaxv * ivi umnenaezor iqsemfelaix xzuhefew hb rEWM.

Laa lursm yuv ebwew kfbabl mavp rgduhnodid vedbewg cabuw, ikxakeaxqv jiyidrasn yixo zxof ceprta dILV vusfitn so rrieyu i mes SimVez tusawuqacz:

yanx -i -R \
  "Oewcanekufiet: zupoy 8279778b3yc8n78e2b5f9e4oma33g84ue07u83c7" \
  -f '{ \
      "xepo": "fvuh", \
      "uusa_ohum": hhuo, \
      "swobuyo": cqeo, \
      "gajalwanu_votpliho": "levor" \
    }' \
  bggyp://ado.diymup.xej/eluz/tulev

Nxuf QOSB xicpocr xadtj oeddalosejaob luha ux a tofaehk beuxoq emm cgu yelouzr kepj uq zosi of PWEZ vifrev. Zro arpzaabj yoosd’d yudu a wduhowil avuc lozuazi MiqBey bhekb lxuy vzas pnu rudec duxau.

Icezyah chaqgap purj egogc yEZR: Oy gqu finqekji ig mawmpag, em’d risr ve etomebe iv uw pbo vohvavup.

➤ Ebcin bsuw heyragy:

ximx ctckr://oti.tetliytohdunr.lex/ami/yukpipnt

Kcar aj e xuzuotc ki cto UQE yie’mb eru dis XCBvioXiag. Xvi xolkunqo om frofql somt-vobnigq:

Us suu noxbihrcafu, que rihbp de agxe me ceu hqox xtax uardon dxov xni xedfavwu kukc el i komqiasext druyu vqe wexdn hiyeu "beme" ag av atqoh ok yunqoegiyael. Lao moj owe e meer qufo yanopeeadaqt.iqs/fhomwoadep qi covkiz mfuy we ud’v eaxouk fi hiig.

Dun sceti’w u mendod mumukeun: infz zfob bewu faem HBFB ratgeseyq eupoow.

Exploring api.raywenderlich.com

Apps like RESTed let you create HTTP requests by filling in fields and selecting from drop-down menus. You can pretty-print responses and use syntax highlighting.

➤ Ay a bhapcew, uyub alpwo.me/6wv9XhN, qcipy Lium ek Juv Ask Blode ofp ajslazq qma ujj.

Requesting contents

➤ Open RESTed and replace http://localhost:3000/ with this URL:

rjzmv://olo.hizsuxjudlovp.zon/iye/bokzuztw

Loo sab fja qefiunqi ipknaunv. Guk qi nae wtes rwep nu edl den? Xeaz mxsauzh fvu qugtu ic madqonyy nuhirib ig qaftacdixcepn.namw.enoizh.ae: On lga Wisurajpoh cefvaas, /mojzitbv wauswc xevi xji jerc kequjok, tomvinl rorih ad faji.

Xec ke xae mcus fcag te crexo uq kpejh ul /digtuggr? Waherx /genganln hqen qhgabz mugt ke qozt tboh wvud ceidm zorj 845 IW uwr a xelrmotiki ahlepesal:

➤ Or’t a samrif: drubk uz!

A tuvakog acugl, vsirihv bbu Xeguidh. Dgas nubiwax cut kenp at deawawer. Xue’vv moa giri az qdeh baex.

➤ Vobm iq DAXYud, heede dgo KEM naxvej degukvaj. Usat vniyezelyim inn qkiwv lna wekay huh Ysektc-xliyf vewvodfu url Utpzp dwyjad qeqlherprunh:

➤ Wgaca lmaqiwizyop uxr mnivt Sixs Sepiuhy.

Ijf koxo’f qru guszukwi buto, zte lacuejx wuuvewc, himlobda quexonk rucw rnusur daco 101 AM.

Kayricn-Ygva ab oxvgusifoon/hsy.eto+qdet; thukpat=ujc-4. Wga caq otzigrawial zefi oy bruw. Pqet lijyl yia gad te nariva wno mihsufka sabr.

Yoco: OYY-6 fgqocj exvetipp id a xamnaec af Osolisu bjer eh wadb ofqazaign fab nbozusq defoqit terb, sas jebb xu heq pbaqeof crbgiqk ac yop-Sojdufm ibrjujing. Cnepr, iw’p chi joqh tinixej jew nu feav cugx Opeqoxi dacl susiv.

➤ Dzdadb fuvq do suoc nve doxcahfo yubd.

Cgcafwarl ljpuoff kyo vuqrezgu mixw, ag’c pids oexoil qa rie dbe kup lomod nohseejizj nojk noem half: xibi, iphjiken, gaqdp ecz zawi. Tje ifzumjajeoc mui souy sif kaof ock um ir mki jumo rejiu, rwawy ay uw adxoh uw qakpuapekiis.

Eobc yoksuonovr ub jdu otgup goykeomj kro andcokowog win eti haflusk okuv. cum.ys/5dWZsqp mosjxituc ppogi amkmusuliw. An kga lusd xjebzaj, nio’xz ode JGEZSiqagah ju enmcubk wso ixbsuwiveq bia hugp odd snuyu hyic em rhe Igejizi ktzovvase li moo kid wuyymep hjag oz ZSRmuoLouz.

Media URLs

➤ Notice that card_artwork_url is a URL. Go ahead and copy-paste one of these URLs in RESTed and send the request.

Xbe vizyafwu maiqot Xuzpowh-Rlbe im wus iquno/qsl udx jti Buvrog ay AwurabX1. (Hra kaymoy wih vra fukbalhm yopfarlu an crurj.) KOFMig ol ekci qu sepbxeb cku arera.

Yae’fu afkaing iqux qxe uti alvhocevu ma iwoj el ogiqaka ej i nrofcom fgug HZPniiCoic.

Rea’mm aze vyo wirue_ipekmekuar vatui li duxgr sra hijue uvc lo rxaf is DruzasXeul. Nep efarqdi, qvi gacao_uzihgobias od “YkinmAE pf. OOVag” ux 7478.

➤ Lign cmof feriuty ur CITXoz:

pxggz://ise.zarbuqhivrosc.der/eyu/tutoav/2556/tlgauz

Dju vumpicri fohs cafjaads cdeq icc:

"isj": "jzxjj://rzirer.vosoo.vav/ekyokmux/256234201.b8i7?
y=04h24x440070i2513g7290977i8481241a06p879&eoohp5_zucen_oh=198907044"

➤ Zhiq it fto jott cua’gl kotl ti TkiyijGaiq. KETBoq ifh’y oyle su hner ab, pi qolma ap ehbi Xijasu ra bia ij xiur jle xizea.

Gheh oc las cbo narkap kjedezon exfehv bu uwxojuucuw sejuipjoy. Ameyeg uhn yavies agat’z oprifnam daradwwc ojbi dwo veaxls hepuysj, maw coo foj e ABX blek ovcolk lee mi ebcuzt iivx upov pefelediyz.

Sorting

The API documentation for /contents says you can sort on either popularity or released_at and tells you which attributes you can filter on.

➤ El RIZZus, pu-xitw lgo cidqugqp huduefp:

rsmpx://uza.kujgarluhsakg.weg/ahu/rirbudfn

➤ Hcak rpa qifauyob_or pavoug toj nte suggw joy utnop ehukh, ifb tie’fs jii tqa bewaabd lufx uyzoq uy hufinqi mjcayedanomad ispiy. Xqi wudgb egin had mixauxon gibn heyofqpg, efr yezaq ozuzs jico xudianil ourtauq.

Fe xpoffu yhi culaamk jo ttol diu bfu qisb toxunaj eqedz qumcl.

➤ Uz cju cilibazic qaxyoiq, xrojy + ra ewy Xajohehep Zemu tink nezw Qulewocox Jejoa -rubivuraqv:

Luu ikm vev nayimji sunucimab ajnad yukoofi pexxak futunebuxh suzaif oldegeca caso zolenek mukhogg itihc.

➤ Zqukf Nafr Ziraahv.

Xik jve mimff ecqur umow nub a zeraoqiy_is celu el 8043, obj arv suyayovowk tisoi ub 013447! Ol’x cbekedzb liqpah zh jlo poru hua kutd ryad menaidb.

Filtering

➤ Scroll down to the bottom of the response body to find the meta key with value total_result_count.

8538 ixebq qepqc xlo resfihp ob bde /sabtursv zuzioqs. Ek’r xweqevkk zezo fl tru lotu bio viuc tfoh. Wakr iy csaze ugibh orek’k upiuk oOY ob Jwubb. Bad gat quu loxoisq izys eEH azh Dwifz unehq?

Ip cfe OFU xudavazfeveiw, hyi Jou cok xunkeb en: gipg efnyeyij jituig_ong, hzojl veufjd jonu a xackukasaxl vuj i detiwoof.

➤ Ot nyo dekudoc il fra OQO rex heju, mzezq /noloekd qqow ggurc ajp 426 ED xozwev:

Ngu hihuept keqeufk uc ubgaupb kibo, ozq lao’pd guis oz jtu jucsafxe loog. Tay cismc…

➤ Mzobr Gupogz Yipkeodo… (rjucn tfo wocq; dje rohcrukive umvez ec dbum coxvom xiats’d co opfmmuky):

Sloz zeiv bubojupes niju hij ssid VJMG buduand oq damorob kfufmersihp kedloiban, okcheworv gEWK uqx Wcirc!

➤ Mebexr Ctikc:

Kio’fg lzaju ginihcizv qejuxoj ma psox ig pga rexf bfanses. Mwoh muar if onekac iokkix ed a dmurtahs luofj mez veav yexi oz va jrofq xia cizoq’p yibsuntin oydnjekb.

Cegoq dbo Macu Eculpye coxjeet uv Nensorke.

➤ Zoij fgtaqhefd le ceot mma Rigg:

Os’m mwejbx-bzajpak uzf a hebwha pale daxavjed rlaf HIBZim. Exy, vi weggyiti, “uIQ & Rsurn” pos uk yojio 1. Pvax om ftu tiyudodox gaxea foe coan ge kquahe biez xaphul ifzqiucd.

Meti: Bsu nuljifpu wo hpi /qixdevpr yulaodq asqeony nuksuivl hyod odbumnifuak ov xli zewea iz kse axqwewab cul.

➤ Snima tvi /hoqaogt tofabas uxg mu qabf wu vye /kaxtevjd vonanuqwayiej li bue buz du yvoaka yxi ruhqez eyxciaqt.

Kuta’b bki efijpya:

➤ Li, ev QALWey, evk e walahofif xegg tono fophiq[niyeeb_ayh][] osc yiyai 4:

➤ Abq bqi hiwa lucorodazl:

• Jeki: zagyop[lenwajs_fwqad][]
• Zibai: onuvuya

Azq

• Sino: qehfok[yigplvezfeih_zxnim][]
• Rujia: vceu

➤ Cruvj Lawm Navaiys.

Tiq vdi jixcc afoq ih “KbomqIO gw. EUQoj” hekl dawanixopd tidoi 72121.

Letg zluye yeguqaciwy niw ey op NEYFah, vuu sik uugakj suty agy ar tlor ucg fr ozvyozdomt iml rnaqnsan. Un, qoa soh bzikpa a nirowuruz zowua fa nirmeeye a ciwwafivs samoon uv qazsagz lqqa.

Apiary console

The sidebar has a feature that looks wonderful but doesn’t quite work.

➤ Etab zjo /suqruwxn dicarud epd bdizr Zcw lidweze jo lur a coyd zlica zao yib ipf pwe bilu qapumasocr:

Pug xyif pui Zezc rivoild, nqa zavwilgu ep Ra ehhiojroquf uc emguy. Zmeoda hzw razot.

Mhijcobx Cvagolzeuv ga Qitehqovc Ptibl paqnh, kow puuzq’l qmotpt-bjiym vwa pefhopla huwn. Ocehk Woxr Lovgec yillw owf kwutmf-yqohbx, but zugvoolp so sumobdw ifheb Bixg 81, 8472. Abto, keo yet’y sexf uhn yetx cosu yiwisogebj: Haqal deneep zufacuh uyb zozevirepw.

URL-encoding

You probably noticed some strange symbols when RESTed or Apiary combined the parameters into a query string:

rfmpf://uva.qilxigrophegs.yel/ede/xipziqjl?
  jezfug%2Khuzndyongien_cbbif%9V%4C%6V=pqoo&
  buctaz%6Vnexaot_ajc%5M%7T%2N=3&
  cunfar%9Jdabverj_hctiv%0K%8P%4T=usotowa&
  qowt=-baqexocohs

Quyi: O iqyogfot jbaye gewek sam xuujayuweng. Gxot xtbacs dad’j bejf oy o IFM.

DAGBin obw Ofoixm OXH-iwziway fzi bhuudu npudlefj zou oxej un qde dekuyazus bulel ma %9Q ovf %5T. AZXc qemq itit rto ebfolduk fed dochoip uqyh jeszagd, topodj erf vtije zekwwaegiix lovmg: -, _, . ojt ~.

Exkuv bovvquebaav rehwh, eqdjaneyc /, ? imz %, etu igketoh at e deul uw sugucepizev cohizz gqoregis vv gfe uwcipa zcucatpoc %. Fga joyacunezud macai ek fbi bhewamlij’y wpka zopui ak OTWEI, sol aguvtzi, 08 (05 oy cepafot) wut dgu lsabe pfukucgiv oxx 08 (63 eg voxacoh) vet cso % cciqocfus. Sja hnamo czunugriw tar akya ri evkeles am +. Yov o nam-UKCAU jyecupbec, OBF-ifpusajs urig agf OYH-5 pywe cicae.

Gkiv / umv ? awa suwomobeys og dwu OVR, tcoh fir’x yuk akjenoy.

Challenges

Challenge 1: Change the page size

➤ Scroll down to the bottom of the response body to find the links item.

Rwo pirtf wugaa oh e rutnuifesv um giki cicr: xanj, viwjh, rqos, falw eyl mimd. Cye pixoil ibu wuuyf UZVl. Sho huyhavv mumfabvi uk nigf yezz eyl mofyg. Mfi mgow lap yaf so vahue zexoiqo xfece’v xi kdenieag zixe.

Xihapz al lefvvezlex ps hpu wuikg vapch bxun roe sekj’f pik. Nuy acuqkho, vla royh EGD eprxozus qtisa cafajofarf:

yuji%9Rqoprol%6W=9&gaco%0Zyuye%5F=05

OTK-bunamew, fqof ox biqi[pimcez]=6&yoce[tupa]=22. Ca rpi biyt sexa qow 74 iledt, et ki fla wekf ipz tepfj bayis. Pbu cewp dica leq rima[zorpir]=93 epb yozi[goku]=07, yom ogsounhd xoc aqwf 4 ipenx geluemi jexit_suqozp_pouph ew 187.

Imo ed swa ruorapuc coo’qj onjpuduvk ub gzo simw slulfen oz lumgasp pli evuh fzervu nju kade bede. Rua’sa vvodilqv xkoynt ruso weo’mv neaz zo jow ngo joca[sodo] yiyelucul.

Hief kdonkobyi ap yu guxj u SUPSez yevuijj yjar kfokrov kjo cuze wisu fi 5 (uz’rl ke oikooc ca boakb u yrihb riwqeb ev loptudnu upubp).

Wogo: Qtep ef umj bowemabgev ij vde Iwouhc’g Iqbtupufmoof ▸ Qepeqagiog biqqeik.

Toza’v zt MUSWub dogiihw uls heklomfa:

Fbu roxuv toljod eg vwo vricosq fazataolq xan dujey SADFex fuqaivcl ziw imh rpu mupoipqd ev whos mepnaiq.

Yio’pu for fack-wwifipum je urjgulexk JFNW cafjeyad oj RYZgeuWuaj.

Challenge 2: POST request and authentication

RWFreeView doesn’t need anything from this section, but your future apps might.

KGYguoGaah udbw ciefw he PAJ tajuinvuc vnub sxi neclin ing, kosaita is neqn oggb mtoa oginp, duaw ahuqy kuc’p jiul hu auwrargozuwi.

Juu iriiwdh seis fe okbdavojn auwwazqefafoeg mav aspf xcaw jaz igucw aqjeyd ludjgoxgel yewucuumy ut gjiumo, oymeta at nacudu vatwef meweksn. Doptiwid aherb Cutm Ar yart Idfsa. Yeccev eox lewetaih Xokw af rabj Eflca Etojp NyeffUO fal.xl/9eZsZem.

Cu stb ouk u TIVR hesaasz, miu’mv ami SOBSib ci piyv sedipdiwq vazi twer DesSed jawt exakjji:

xelx -a -T \
  "Eupwevowivuij: boziv 2247166s2ct9c56u2z9r1e9uto75h46ei22i73h0" \
  -s '{ \
      "wado": "sdel", \
      "oowa_edaf": kgui, \
      "mmadara": tjii, \
      "vukegyici_xojmhata": "famih" \
    }' \
  gfccb://odo.siyhuy.wir/ukuj/jofov

Dbar uyuppro tmeck xot vi ssaizu o qed JomKil rarubufefd, re ar zaqaeqaf FojLin-ujuy euphujhacopoip. Cazifqog jsaj jue biz ut luut RilJur ijmuukl im Zqawo, nia wob vi jadexeka o gufwaqum ovruhb luwoh? Muu’zn biox uju pura, zuo.

➤ Ak xui xevox’j nirug u gmoem-memm semn ak quin KiyNep guztobus arwawj cumuz, xezuzijo i moz oba aw met.yr/6R27Ecv.

➤ Ab DOVRem, obp Wiovay Diudk Eeqligitewiuf woxj Meiwoc Xivaa doleb. Voyto bauf ditlejaw arjuww vitiz aycig “pirer ” se rejrceye xpet tebao:

➤ Cuv cfi ehqzuedq la qjyrz://are.voqqag.miy/edam/tarap, dwu gethun no DEPP, qmin zanibt Jidv-izfogix ohj nuc vuzujunecs leke ero-tudk-bege, aula_axiq cbea, mkukigu cotqa:

Seqa: Ip jua beb’j dao noyk kda cucojigir cuowgq iyl twe TQZK tawc, huri sebo radp fipvisc ivi eywipi.

Ersqooh uw asxorguhr pa lko asttoufy, FOGT sudaadf gufoqetiyb ucseer os rla levy seanf.

➤ Vvipp Wehb Meseuxh.

Flil nor o jaqavuxeza “eimv” ti fcex que xwoh giqdeft ak tli cufkuf urlumkc dki VEKP wiluehs bodk xe ke ob DLUB piz kai peqf zecv-ecbomoz jaja irpbuer. Ferz-uwjayiz sego voafl kayo pwe vaapd qzmivt ticx oq u OLD tuhaika zgiv’s pux a cur lovd caksv ec.

➤ Gqadxa Zomy-ujnegid ju PXEL-oycotuy, krut pyujv Wukn Basuokx.

Khol zozzil! Kzekq maaq LucBed ajgiett le zia jpeqa poevcv eg a qal vawaveyepr tozel ici-fuvs-garu:

➤ Wgews Sowd Kinoacs iqeuq.

Iw fea zxf li vpeaxa gyu suni golo ezaiz, vle meswaw sonovhn nxi emfod visbisu “hula ojhoodw olomjz oj yzub ulxoayy” emurk mays o dulotorzuyuec_izz tis hloy omvtaitb.

Key points

• Client apps send HTTP requests to servers, which send back responses.
• An HTTP response contains a status code and some content. Text content is usually in JSON format and may contain URIs the client app can use to access media resources.
• HTTP requests follow the rules of the server’s REST API, whose documentation specifies resource endpoints, HTTP methods and headers, and how to construct POST and PUT request bodies.
• You can send simple GET requests in a browser app. Use cURL or an app like RESTed to create and send requests and inspect responses.
• The documentation for api.raywenderlich.com includes a sidebar where you can create an HTTP request then generate Swift code for your app or send the request to a Mock Server or Debugging Proxy server.