javascript - How to use server-sent-events in express.js -

-

i setup rest server express.js. want add sse server. after implemented this sse package, error. know error, when try use res.send twice, not.

error: error: can't set headers after sent.                                                 @ serverresponse.outgoingmessage.setheader (http.js:690:11)                                 @ serverresponse.header (/home/root/node_modules/express/lib/response.js:718:10)              @ serverresponse.send (/home/root/node_modules/express/lib/response.js:163:12)                 @ app.get.str (/home/root/.node_app_slot/main.js:1330:25)                                      @ layer.handle [as handle_request] (/home/root/node_modules/express/lib/router/layer.js:95:5)         @ next (/home/root/node_modules/express/lib/router/route.js:131:13)                            @ sse (/home/root/node_modules/server-sent-events/index.js:35:2)                               @ layer.handle [as handle_request] (/home/root/node_modules/express/lib/router/layer.js:95:5)       @ next (/home/root/node_modules/express/lib/router/route.js:131:13)                               @ route.dispatch (/home/root/node_modules/express/lib/router/route.js:112:3)

is possible can't use express methods anymore within sse function? example:

app.get('/events', sse, function(req, res) {     res.send('...'); });

furthermore, found this solution , this. possible make sse res.write function or in way without using package?

you can achieve without other packages.

i wrote blog post this, part 1 sets out basics.


Comments

Post a Comment

Popular posts from this blog

ruby - Trying to change last to "x"s to 23 -

-
i have been playing around irb , have string looks this: irb(main):072:0> puts ["[\"4354 5432 5432 xxxxx\", \"6547 6547 8543 xxxxx\", \"2344 6543 6674 xxxxx\", \"2346 6236 7543 xxxxx\", \"1273 5585 5587 xxxxx\"]"] => nil irb(main):073:0> what want gsub last 2 "x" s of each 17 digit combination, 23 . what i've tried far (i've been using rubular): a.gsub(/\d[x]/,"23") <= grabs "x" s i'm close a.gsub(/\w[x{2}]/,"23") <= grabs "x" s grabs two digits each combination. is there easier way i'm not understanding? a.gsub(/\d{4} \d{4} \d{4} xxx\kxx/, '23') \d{4} = 4 digits what \k drop matched far. can use don't replace entire number, still able validate have in desired format.
Read more

jquery - Clone last and append item to closest class -

-
this bare-bones code on page: <div class="list-container"> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> </div> <p><button class="add-list-item">add</button></p> <div class="list-container"> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> </div> <p><button class="add-list-item">add</button></p> <di...
Read more

css - Can I use the :after pseudo-element on an input field? -

-
i trying use :after css pseudo-element on input field, not work. if use span , works ok. <style type="text/css"> .mystyle:after {content:url(smiley.gif);} .mystyle {color:red;} </style> this works (puts smiley after "buu!" , before "some more") <span class="mystyle">buuu!</span>a more this not work - colors somevalue in red, there no smiley. <input class="mystyle" type="text" value="somevalue"> what doing wrong? should use pseudo-selector? note: cannot add span around input , because being generated third-party control. :after , :before not supported in internet explorer 7 , under, on elements. it's not meant used on replaced elements such form elements (inputs) , image elements . in other words it's impossible pure css. however if using jquery can use $(".mystyle").after("add smiley here"); api docs on .after to ...
Read more