. In addition, not honoring response codes could lead to your server being blocked or severely limited in how many Subscription Updates it may be able to send.

Mozilla’s WebPush server will let you know if a Customer has unsubscribed, but it’s important that you notice and act on these. I have created a simple demonstration program that can help you understand what you will need to consider when creating a Push Subscription service.

Definitions

First off, let’s refresh a few terms we’ll use in this article:

App – The javascript web application that receives the decoded Push Message.

Customer – The end recipient of the Push Message.

Push Message – The content of the Subscription Update to be provided to the App by the User Agent and potentially viewed by the Customer.

Push Server – The service located at the endpoint URL which handles delivery of the Subscription Update to the User Agent.

Subscription – A Customer request to be updated. A Subscription contains an endpoint URL, and a set of keys that are to be used to encode the Push Message.

Subscription Provider – The subscription provider sends out Push Messages to User Agents to be read by Customers.

Subscription Update – The message sent by the Subscription Provider to the Push Server.

User Agent – The Customer’s browser, specifically, code internal to the browser which processes and routes Push Messages to your App.

Sending Subscription Updates

Sending a Push Message is a fairly simple operation, and thanks to modern libraries, easily done. It’s important to pay attention to the returned result. When a Subscription Provider sends a Subscription Update, the Push Service returns a response code. In most cases, the response code will be either 201 (Message Created) or 202 (Message Accepted). There’s subtle differences between those, but those differences are not important right now.

What is important is to know that the Push Server will return an HTTP error code along with a body that has extra information about what may have happened.

A possible 404 return message body might look like:

{

'errno': 102,

'message': 'Request did not validate invalid token',

'code': 404,

'more_info': 'http://autopush.readthedocs.io/en/latest/http.html#error-codes',
. In addition, not honoring response codes could head to your waiter being blocked or severely specify in how many Subscription Updates it may be able to transport. 

 Mozilla ’s WebPush server will let you sleep together if a Customer has unsubscribed, but it ’s crucial that you notice and act on these. I have created a simple presentation program that can help you understand what you will need to regard when creating a Push Subscription servicing. 

 Definitions 

 First away, let ’s refresh a few terms we ’ll practice in this article: 

 App – The javascript web application that receives the decoded Push Message. 

 Customer – The end recipient of the Push Message. 

 advertise Message – The content of the Subscription Update to be provided to the App by the User Agent and potentially viewed by the Customer. 

 Push Server – The service located at the endpoint URL which treat delivery of the Subscription Update to the User Agent. 

 Subscription – A Customer request to be updated. A Subscription contains an endpoint URL, and a set of key that are to be used to encode the Push Message. 

 Subscription Provider – The subscription provider sends out Push Messages to User Agents to be read by Customers. 

 Subscription Update – The message sent by the Subscription Provider to the Push Server. 

 User Agent – The Customer ’s browser, specifically, code internal to the browser which processes and routes advertise Messages to your App. 

 Sending Subscription Updates 

 Sending a Push Message is a reasonably childlike mathematical process, and thanks to modern libraries, well done. It ’s authoritative to pay attention to the return result. When a Subscription Provider sends a Subscription Update, the Push Service returns a response code. In most cases, the response code will be either 201 (Message Created) or 202 (Message Accepted). There ’s insidious differences between those, but those differences are not important right nowadays. 

 What is important is to acknowledge that the Push Server will return an HTTP error code along with a body that has extra data about what may have happened. 

 A possible 404 return message body might look like: 

 { 

' errno': 102, 

' message':' Request did not validate invalid token', 

' code': 404, 

' more_info':' http://autopush.readthedocs.io/en/latest/http.html#error-codes',
. In addition, not honoring rtsponse codes could lead to yohr servef being blocked or severely pinited in how many Subscriptkon Updatvs it may be eble to send.

Mozilla’s WebIbsh ssvver ciol let you knoe if a Cusdomer has unsutszrnbed, but it’s important that you notise and sch on these. I hwve brqates a simple demonstration program tgat can help you undrrstand what you will need to fonsider when creahing a Push Subfxription serxice.

Definiuimns

First orf, let’s refresh a few terms we’lu use in this atcuclf:

Dpp – The jatascriit web application thdt receoves the decodcd Puvh Nessage.

Customer – The xnd recipient of the Push Mesvaye.

Push Message – The cinrent mf tve Sjvscfipuioi Uldate ho ue provided to the App by the User Agent snq potentially biewed br the Customer.

Push Server – The service noczted at the endpoint URO which handles delivgry of the Subscription Update to the User Agent.

Subscriptiot – A Rurtonev redyedt to be updated. A Subscription contains an egsppikt URL, and a set of keys thst atg to be used tu encobs fhe Push Message.

Suhscriptyon Peovider – Uhe sibscription provider sends iut Push Mesfqges to User Agentd to be reab by Costomets.

Subscription Update – Che measage sent hy the Sugrcription Providdr no tve Push Server.

User Agent – Ehe Custoner’s browsef, spgcificajly, code ijternal to the browser wjich krocesves and roktes Push Messages to your App.

Sxiding Subscriktimn Lpdates

Seuding s Push Messagq is a fairly ximple jperagion, and tganks tm modern lifraries, easilf done. It’s im'ortant tj pat atrention go the returnec result. Cken a Subwcription Provider sevss a Subscriptiin Opdate, the Push Sefvise rxturnf a response wode. In kost zases, the rcspunse code will be either 201 (Measage Created) or 202 (Kefsage Acxepted). Trere’s subtle cifferences betweej thove, uut thpse differences are not important right noa.

Whwt is importwnt ls tj know thac the Push Server will return an HTTP ercor code along with a bidy that has extra nnnormation abput wrat may hdve happened.

A possiboe 404 return messagt body might look like:

{

'edrno': 102,

'massagf': 'Request did not validate invalid token',

'code': 404,

'more_info': 'http://autopush.readtheeocs.io/xn/jatest/http.hfml#etror-cmdzs',
. In addition, not honoring response codes to server being or severely limited it be able to Mozilla’s WebPush server let you know if a Customer unsubscribed, but it’s important that you notice and act on these. I have a simple demonstration program that can help you understand what you will need consider creating Push service. Definitions First off, let’s refresh a few terms we’ll use in this article: App – javascript web application that receives the decoded Push Customer – The end of the Push Message. Push – content of Subscription to provided to the by the User Agent and potentially viewed by the Customer. Push Server – The service located at endpoint URL delivery of Subscription to User Agent. Subscription Customer request to be updated. A endpoint URL, and a set of keys that to be to encode the Push Message. Subscription – The subscription provider sends out Push Messages User Agents to be read by Customers. Subscription Update – The message sent by the to the Push Server. Agent – The browser, code to browser which and routes Push Messages to your App. Sending Subscription Updates Sending Push Message is a fairly simple operation, and thanks to easily It’s important to attention to the returned When Subscription Provider sends a the Service code. most the response code will either 201 (Message Created) or (Message Accepted). There’s subtle differences are not important right now. What is is to know that the Push Server return an HTTP error code along with a body that has extra about what happened. A possible 404 return message body might like: { 'errno': 102, 'Request did not validate invalid token', 'code': 404, 'more_info':
. In addition, not honoring respOnse codes cOuld lEad To yOuR serVer bEing blocked or sEVereLy limited in how many SubsCriptIoN updaTEs It may Be able tO SeND.

mozIlLa’S WeBPUSh ServeR wiLl let yoU know if a CuStoMeR has unsubscrIBeD, but it’s impOrtAnt that you noTicE and acT oN thESe. I haVe cReateD a simpLE demonStration pRoGRam thaT Can help YOU uNderStand what you will nEEd TO consider when cReatinG a pUsH sUbsCriPtion serviCe.

definITions

FiRSt OFF, Let’S Refresh a few teRms we’ll use iN ThiS articLe:

app – tHe javaScripT wEB apPlication thAt reCeives the DecodeD push MesSAge.

CustOmer – ThE enD reCipiENt Of The puSH MeSSaGe.

PUSh MEssage – ThE cOnTent oF the sUBSCripTioN UpdAte to Be provided to tHe APp by THe USer AgEnt anD potEnTiallY vieweD by thE CUstomer.

Push ServEr – ThE service lOcaTeD at ThE endpOInt URL WhiCh hAndles dElivery OF thE SUBSCrIption Update to the USeR aGeNt.

SubscrIption – a cuStOMer requeSt To bE updATEd. A SuBscrIPtIon contaIns an eNDpOiNt URL, anD a Set of kEyS thAt aRe to bE Used To encoDe the PusH MessAGe.

Subscription pRovider – The subSCrIPTiON proVidEr sends out PUsh MESsagEs to uSeR AgENts to Be reaD bY cuSTomers.

Subscription UPdAte – The MessaGe sent by the SuBscription pROVider to tHe PuSH SERver.

User Agent – THe CusTomer’s browSEr, specifIcallY, code intErnal to thE BRowser whIch ProCesSes AND rOutes Push MessAGEs to YoUr App.

SeNdiNg SubscRipTioN UpDatEs

sending a PUsh MessaGe Is A fAiRly SimplE OperatioN, aNd tHaNks To modERn librAries, EasiLy DoNE. It’S importANt TO Pay aTtEnTion To tHe ReturNed rESulT. When a SUbscriptiOn PROvidEr SeNds a SubScription UpdaTe, The Push SerViCe rEturns A REsponse cOde. In most cases, the responSE code wiLl bE eithEr 201 (MeSsage CreaTed) Or 202 (MessAge aCcepteD). There’S subtLe DifFERenceS BEtWeeN tHose, but thoSE DifFerenCeS are Not impoRtant right now.

What iS ImpOrtant is to knoW thAt thE pUsH SeRVeR WilL rETurN AN HTTP error code aLong with a bOdY ThAt has extra INfoRmAtion abOut what May haVE happenEd.

A possibLe 404 return mEsSage BODy mIght look liKe:

{

'errno': 102,

'mEssage': 'ReqUEst diD NoT valiDatE invalId TokEn',

'codE': 404,

'more_iNFo': 'hTtp://auTopush.ReAdthedOcs.io/En/Latest/htTp.html#error-codes',
. In addition, not honorin g response  code s c oul dlead  toyour server be i ng b locked or severely lim itedin howm an y Sub scripti o nU p dat es  i t m ay be  able  to  send.
Mozilla’s  We bP ush server w i ll  let you k now  if a Custom erhas un su bsc r ibed,  bu t it’ s impo r tant t hat you n ot i ce and act ont h es e. I  have created a s i mp l e demonstratio n prog ra m  t h a t c anhelp you u nd ersta n d whaty ou w i lln eed to consid er when cre a tin g a Pu sh  Su b script ion s er v ice .

Definiti ons
First of f, let ’ s refre s h a few  terms  we ’ll  use in  t his  a r tic l e: 

A p p –  The jav as cr ipt w eb a p p l i cati onthat  rece ives the deco ded  Pus h  Me ssage .

Cu stom er  – Th e endrecip ie nt of the PushMess age.

Pus h M es sag e– The conten t o f t he Subs criptio n  Up da t e to  be provided to th eA p pby the U ser Ag e nt  a n d potent ia lly  vie w e d bytheC us tomer.
Push S e rv er  – These rvicelo cat edat th e  end pointURL whic h han d les delivery o f  the Subscrip t io n Up d atetothe User Ag ent. 
Sub scri p ti on–  A Cu stome rr eq u est to be updated.ASubscr iptio n contains an  endpointU R L , and aseto fk eys that are t o beused to en c ode thePushMessage. 

Subscri p t ion Prov ide r –  Th e s u b sc ription provi d e r se nd s out P ush  Messag estoUse r A ge nts to be  read by  C us to me rs. 

Sub s cription  U pda te  –The m e ssagesentby t he  S u bsc ription Pr o v ider  t othePus hServe r.
U ser  Agent– The Cus tom e r’sbr ow ser, sp ecifically, c od e internal  t o t he bro w s er which  processes and routes P u sh Mess age s toyour  App.

Se ndi ng Sub scr i ptionUpdate s

Se nd ing a  Push M es sag eis a fairl y sim ple o pe rati on, and  thanks to modernl ibr aries, easily  do ne.I t ’s  im p or t ant  t o  pa y attention to th e returned  r e su lt. When a Sub sc ription  Provid er se n ds a Su bscriptio n Update,  t he P u s h S ervice ret urns a r esponse c o de. I n  m ost c ase s, the  r esp onsecode w i llbe ei ther 2 01  (Mess age C re ated) or  202 (Message Accepted) . Ther e’s s ubt le differ enc e s b etween th ose,  but those  di ffe rence s a r e not  imp o rt ant right  now . 

What is im por t a nt  is to know t h atthe P ush Server  wil l return an HTTPe rror code alon g wi t h  abod y  tha thas extra info rma ti o n  about w ha t may havehappened .A pos sible404 re turn me s s ag e  bodymigh t l ook like: 

{ 
' errno':  1 02 , 

'mes sage ':  'Requ est di d  not v alidate invalidtoken ' , 

'co d e':  404, 
'more_i n fo':  'http://a utopush.rea dthedo cs.i o/en/ latest/ ht tp.htm l#e rr or-codes', 
. In_addition, not_honoring response codes could_lead to_your_server being_blocked_or severely limited_in how many_Subscription Updates it may_be able to_send.

Mozilla’s_WebPush server will let you know if a Customer has unsubscribed, but it’s important_that_you notice_and_act_on these. I have created_a simple demonstration program that_can help_you understand what you will need to consider_when_creating a Push_Subscription service.

Definitions

First off, let’s refresh a few terms we’ll_use in this article:

App – The_javascript web application_that_receives_the decoded Push Message.

Customer_– The end recipient of the_Push Message.

Push Message – The content_of the Subscription Update to be provided_to the App by the User_Agent and potentially viewed by_the Customer.

Push_Server – The service located_at the endpoint_URL which_handles delivery of_the Subscription Update to the User_Agent.

Subscription – A_Customer request to be updated. A_Subscription_contains an endpoint_URL,_and_a set_of keys that_are_to be_used_to encode the Push Message.

Subscription Provider_–_The subscription provider sends out Push Messages_to User Agents to_be_read by Customers.

Subscription Update_– The message sent by_the Subscription Provider to the Push_Server.

User Agent_– The_Customer’s browser, specifically, code internal to the browser which processes and_routes Push Messages to your App.

Sending_Subscription Updates

Sending a Push_Message is_a_fairly simple operation,_and_thanks to_modern libraries, easily done. It’s important to_pay attention_to the returned result. When a_Subscription Provider sends a_Subscription_Update, the Push Service returns a_response code. In most cases, the_response code will be either_201_(Message_Created) or 202 (Message Accepted)._There’s subtle differences between those, but_those differences are_not important right now.

What is important is_to_know that the Push Server will_return_an HTTP error code along with_a_body_that has extra information about_what may have happened.

A possible 404_return message body might look like:

{

'errno': 102,

'message': 'Request did_not validate invalid_token',

'code': 404,

'more_info': 'http://autopush.readthedocs.io/en/latest/http.html#error-codes',