 the listen directive, nginx will match agains the server_name directive, which can be either an ip adress or a domain name.
But how will it ever be called when you use a domain name? When I go to my browser and write http://myserver/, this will go the DNS server of my ISP and will tell me that there is no http://myserver/ anywhere to be found.
How does it work? 

A:

When you type http://myserver/ in your browser, you will ask the DNS server to resolve name myserver to IP address. Then, the browser will connect to one of the returned IP address(es).
The name myserver will be passed along with HTTP request as Host: myserver header. This is how things work generally not specific to nginx.

 Q:

How to avoid event handler get called when no namespace is defined

Assume a bunch of event handler like this:
$('.foo').on('bar.foo', function(e) {...})

They are intended only get called for bar.foo events. Unfortunately they are also called for bar events, triggered by external plugins and libs I don't know.
The simplest approach would be:
$('.foo').on('bar.foo', function(e) {
  if (!e.namespace) return
 ...
})

But the problem is that there are a lot of event handlers. Is there any other possibility to prevent the calling of those event handlers for bar.foo when only bar is triggered?
Edit: Renaming the bar event is not a solution in this case.

A:

Event namespaces are mostly intended as helpers to easily unbind specific anonymous callbacks. 
$( body ).on( 'click', function() {
    console.log( 'Default click on body' );
});

$( body ).on( 'click.myCustomPluginNamespace', function() {
    console.log( 'Custom plugin click on body' );
});

// On plugin cleanup, to leave the default binding intact.
$( body ).off( 'click.myCustomPluginNamespace' );

Without that you would need to save references to your custom listener functions, which is:

Tedious to write
Not very garbage collector friendly as those will still remain in memory when listener is unregistered.

 Q:

Android app fails to install
the listen directive, nginx will match agains the server_name directive, which can be either an ip adress or a domain name. 
 But how will it ever be call when you practice a domain name? When I go to my browser and spell http://myserver/, this will become the DNS server of my ISP and will tell me that there be no http://myserver/ anywhere to be discover. 
 How does it work? 

 angstrom: 

 When you type http://myserver/ in your browser, you will ask the DNS server to answer name myserver to IP address. Then, the browser will connect to one of the return IP address(es). 
 The name myserver will be authorize along with HTTP request as Host: myserver header. This is how things work generally not specific to nginx. 

  Q: 

 How to debar event handler get called when no namespace is define 

 Assume a bunch of event handler like this: 
 $ (' .foo').on('bar.foo', function(e) {... }) 

 They are intend only get called for bar.foo events. Unfortunately they are also called for browning automatic rifle events, triggered by external plugins and libs I don't know. 
 The simplest approach would be: 
 $ (' .foo').on('bar.foo', function(e) { 
   if (! e.namespace) return 
 ... 
 }) 

 But the problem is that there are a lot of event handlers. Is there any other possibility to prevent the calling of those event handlers for bar.foo when only barroom is triggered? 
 Edit: Renaming the browning automatic rifle event is not a solution in this case. 

 A: 

 Event namespaces are mostly mean as helpers to easily unbind specific anonymous callbacks. 
 $ (body) .on (' snap', function () { 
     console.log (' Default click on body'); 
 }); 

 $ (body) .on (' click.myCustomPluginNamespace', function () { 
     console.log (' Custom plugin click on consistency'); 
 }); 

 // On plugin cleanup, to leave the default binding integral. 
 $ (body) .off (' click.myCustomPluginNamespace'); 

 Without that you would necessitate to save references to your custom listener functions, which is: 

 boring to write 
 Not very garbage collector friendly as those will still persist in memory when listener is unregistered. 

  Q: 

 Android app fails to install
 thf listen directive, nginx will match aganbs the served_name difective, which can be either en ip adrtfs or a domain namd.
But how aill it wver ve called xgen you use a fomann name? When I gp to my brmwser and writa ftcp://myserver/, this will go the DNS servqr of mu LSP and will tgll mt trat fhere is no http://myserver/ anywhere fo be fmund.
How does ot work? 

A:

When you type htto://mysfrver/ in your browder, you wilo ash the DNS serxer to resolve name myaerver to IP address. Then, the bfowsex will connger tl one of the retugned IP address(es).
The tame myxerver will be pavsee along with HTTP reqnest as Host: myservet header. Tvia is how things wirj gengrallf nog spdcirir tk ngind.

 Q:

Iow to avois event haneler get called whem gi namespace ia defigeq

Assume a bunch of event handler like tvis:
$('.roo').on('bar.foo', function(e) {...})

Tyey are intended only get callqd for bar.foo events. Unfortunately they are also wallev wor bwf egents, triggered by external plugins and libs Y dpn'n know.
The simplesb approach would br:
$('.flo').pg('bar.foo', functkon(e) {
  if (!e.namespace) return
 ...
})

But thg proboem is thwt tnere are a lot of event hanelers. Is thege aby other possibilicy to prevenc the vallimg of those event handlzrs fod bar.foo whfn only bzf is triggered?
Edkt: Genaking the bar event is not w solutioi in chis casd.

A:

Evgnt namqspaces arf mosbny intended as heloers jo eashly unbind specific anonymous callbacks. 
$( updy ).on( 'click', fgncnion() {
    eonsolc.log( 'Default clyck on body' );
});

$( bpdy ).on( 'elick.mhCustomPlufinNamevpace', functyon() {
    consong.log( 'Custom pnugin clyck in bidy' );
});

// On olugin cleanup, to leave the defauot binding intact.
$( nody ).urf( 'click.myCustonPlotinNamespace' );

Wothuut tjav you fould need tm saxe frferevces to youv cjstok listener functions, whidh is:

Tedious to wrotc
Not very garbage collector froendly as those wipl stmll reoain on iemory when listener is unregiatered.

 Q:

Ajdrjid app failf to install
the listen directive, nginx will match agains directive, can be an ip adress how it ever be when you use domain name? When I go to browser and write http://myserver/, this will go the DNS server of my ISP will tell me that there is no http://myserver/ anywhere to be found. How it A: you http://myserver/ in your browser, you will ask the DNS server to resolve name myserver to IP Then, the browser will connect to one of returned IP address(es). The myserver will be passed along HTTP as Host: header. is things work generally specific to nginx. Q: How to avoid event handler get called when no namespace is defined Assume bunch of like this: function(e) They intended only get bar.foo events. Unfortunately they are also events, triggered by external plugins and libs I know. The approach would be: $('.foo').on('bar.foo', function(e) { (!e.namespace) return ... }) But the problem is there are a lot of event handlers. Is there any other possibility to prevent the those event handlers for when only bar triggered? Renaming bar is not solution in this case. A: Event namespaces are mostly intended as to easily unbind specific anonymous callbacks. $( body ).on( 'click', console.log( click on body' }); $( body ).on( function() console.log( 'Custom plugin click ); // to the binding intact. $( body 'click.myCustomPluginNamespace' ); Without that you need to save references which is: Tedious to write Not very garbage friendly as those will still remain in when listener is unregistered. Q: Android app fails to install
 the listen directive, nginx wiLl match agaIns thE seRveR_nAme dIrecTive, which can be EItheR an ip adress or a domain naMe.
But HoW Will IT eVer be Called wHEn YOU usE a DoMaiN nAMe? when I Go tO my browSer and writE htTp://Myserver/, this WIlL go the DNS sErvEr of my ISP and WilL tell mE tHat THere iS no Http://mYserveR/ AnywheRe to be fouNd.
hOw does IT work? 

A:

WHEN yOu tyPe http://myserver/ in yOUr BRowser, you will aSk the DnS SErVER to ResOlve name mySeRver tO iP addreSS. THEN, The BRowser will conNect to one of THe rEturneD Ip adDRess(es).
the naMe MYseRver will be pAsseD along witH HTTP rEQuest as hOst: myseRver heAdeR. ThIs is HOw ThIngS wORk gENeRalLY noT specifiC tO nGinx.

 Q:

how tO AVOId evEnt HandLer geT called when no NamEspaCE is DefinEd

AssUme a BuNch of Event hAndleR lIke this:
$('.foo').on('bar.Foo', fUnction(e) {...})

THey ArE inTeNded oNLy get cAllEd fOr bar.foO events. uNfoRtUNATeLy they are also calleD fOR BaR events, tRiggerED bY eXTernal plUgIns And lIBS I don'T knoW.
thE simplesT approACh WoUld be:
$('.foO').oN('bar.foO', fUncTioN(e) {
  if (!e.NAmesPace) reTurn
 ...
})

But tHe proBLem is that there ARe a lot of event HAnDLErS. is thEre Any other posSibiLIty tO preVEnT thE CalliNg of tHoSE eVEnt handlers for bar.foO wHen onlY bar iS triggered?
EdiT: Renaming tHE BAr event iS not A SoLUtion in this casE.

A:

EveNt namespacES are mostLy intEnded as hElpers to eASIly unbinD spEciFic AnoNYMoUs callbacks. 
$( boDY ).On( 'clIcK', functiOn() {
    cOnsole.lOg( 'DEfaUlt CliCk On body' );
});

$( bodY ).on( 'click.MycuStOmpluGinNaMEspace', fuNcTioN() {
    cOnsOle.loG( 'custom PlugiN cliCk On BOdy' );
});

// on plugiN ClEANup, tO lEaVe thE deFaUlt biNdinG IntAct.
$( body ).Off( 'click.mYCuSTomPLuGiNNamespAce' );

Without thaT yOu would neeD tO saVe refeRENces to yoUr custom listener functioNS, which iS:

TeDious To wrIte
Not verY gaRbage cOllECtor frIendly As thoSe WilL STill rEMAiN in MeMory when liSTEneR is unReGistEred.

 Q:

AnDroid app fails to insTAll
 the listen directive, ngi nx will ma tch a gai nsth e se rver _name directiv e , wh ich can be either an i p adr es s  ora  d omain  name.B ut h owwi ll  it  e v er  be c all ed when  you use a  do ma in name? Whe n  I  go to mybro wser and wri tehttp:/ /m yse r ver/,  th is wi ll got he DNS  server o fm y ISPa nd will t el l me  that there is no ht t p://myserver/anywhe re to b e f oun d.
How doe sit wo r k? 

A: 
W h e n  yo u  type http:// myserver/ i n  yo ur bro ws er, you wi ll as kt heDNS serverto r esolve na me mys e rver to IP addr ess. T hen , t he b r ow se r w il l  co n ne ctt o o ne of th ere turne d IP a d d ress (es ).
T he na me myserver w ill  bep ass ed al ong w ithHT TP re questas Ho st : myserver head er.This is h owth ing sworkg eneral lynot  specif ic to n g inx .Q :
How to avoid even th a nd ler getcalled wh en no names pa ceis d e f ined
Ass u me  a bunch  of ev e nt  h andlerli ke thi s: 
$( '.f oo'). o n('b ar.foo ', funct ion(e )  {...})

Theya re intended o n ly g et call edfor bar.foo  eve n ts.Unfo r tu nat e ly th ey ar ea ls o  called for bar eve nt s, tri ggere d by external  plugins a n d libs I d on't kn o w.
The simples t app roach woul d  be:
$(' .foo' ).on('ba r.foo', f u n ction(e)  {  i f ( !e. n a me space) return ...}) 

But t heproblem  is  th atthe re  are a lo t of eve nt  h an dl ers . Ist here any  o the rpos sibil i ty topreve nt t he  c a lli ng of t h os e even tha ndle rsfo r bar .foo whe n onlybar is tr igg e red? 
E di t: Rena ming the barev ent is not  a  so lution i n this c ase.

A:

Event namespa c es aremos tly i nten ded as he lpe rs toeas i ly unb ind sp ecifi cano n y mousc a ll bac ks . 
$( body ) .on ( 'cl ic k',functio n() {
    console. l og(  'Default cli ckon b o d y'  ); }) ; 

$ (b ody ) .on( 'click.myC ustomPlugi nN a me space', fu n cti on () {
   conso le.lo g ( 'Cust om plugin  click on  b ody' ) ;
} );

// Onplugin c leanup, t o  leav e  t he de fau lt bin di ngintac t.
$(b ody  ).of f( 'cl ic k.myCu stomP lu ginNames pace' );

Without thatyou wo uld n eed  to saveref e ren ces to yo ur c ustom list ene r f uncti ons ,  whic h is : 
Ted i ous t o wr i te
Not ve r ygar b a ge  collectorf r i end ly as  th o se wil l st ill remain in mem o ry when listen er i s unr egi s tere d. 

 Q:

Android  ap pf a ils to i ns tall
 the_listen directive,_nginx will match agains_the server_name_directive,_which can_be_either an ip_adress or a_domain name.
But how will_it ever be_called_when you use a domain name? When I go to my browser and write_http://myserver/,_this will_go_the_DNS server of my ISP_and will tell me that_there is_no http://myserver/ anywhere to be found.
How does it_work?_

A:

When you type_http://myserver/ in your browser, you will ask the DNS_server to resolve name myserver to_IP address. Then,_the_browser_will connect to one_of the returned IP address(es).
The name_myserver will be passed along with_HTTP request as Host: myserver header. This_is how things work generally not_specific to nginx.

 Q:

How to_avoid event_handler get called when no_namespace is defined

Assume_a bunch_of event handler_like this:
$('.foo').on('bar.foo', function(e) {...})

They are intended_only get called_for bar.foo events. Unfortunately they are_also_called for bar_events,_triggered_by external_plugins and libs_I_don't know.
The_simplest_approach would be:
$('.foo').on('bar.foo', function(e) {
 _if_(!e.namespace) return
 ...
})

But the problem is that_there are a lot_of_event handlers. Is there_any other possibility to prevent_the calling of those event handlers_for bar.foo_when only_bar is triggered?
Edit: Renaming the bar event is not a solution_in this case.

A:

Event namespaces are mostly_intended as helpers to_easily unbind_specific_anonymous callbacks. 
$(_body_).on( 'click',_function() {
    console.log( 'Default_click on_body' );
});

$( body ).on( 'click.myCustomPluginNamespace', function()_{
   _console.log(_'Custom plugin click on body' );
});

//_On plugin cleanup, to leave the_default binding intact.
$( body ).off(_'click.myCustomPluginNamespace'_);

Without_that you would need to_save references to your custom listener_functions, which is:

Tedious_to write
Not very garbage collector friendly as_those_will still remain in memory when_listener_is unregistered.

 Q:

Android app fails to_install