easypost - Getting a 401 when making a HTTP POST request using CORS in Dart -

-

i trying build small web app in dart. app calls easypost web service, illustrated curl call:

$ curl -x post https://myuserid@api.easypost.com/v2/trackers -d 'tracker[tracking_code]=ez1000000001' -d 'tracker[carrier]=fedex'

here dart code attempted match request:

// configuration parameters var url = "https://myuserid@api.easypost.com/v2/trackers"; var data = {   'tracker[tracking_code]': '$packageno',   'tracker[carrier]': 'fedex'  };  // make request var request = new httprequest(); request   ..open("post", url, async: true)   ..withcredentials = true   ..onloadend.listen((_) => print(request.responsetext))   ..send(data.tostring());

when run in webstorm code fails when making request cors error:

post https://api.easypost.com/v2/trackers 401 (unauthorized) xmlhttprequest cannot load https://api.easypost.com/v2/trackers. no 'access-control-allow-origin' header present on requested resource. origin 'http://localhost:63342' therefore not allowed access. response had http status code 401.

isn't supposed handled automatically? or need add headers request myself?

the headers need added server, otherwise client won't make request. post request browser makes preflight request check cors headers. if not added server, browser doesn't make actual post request.

if server doesn't add these headers it's not intended used way.

there possible workarounds: http://usamadar.com/2012/06/24/getting-around-browsers-same-origin-policy-sop-with-proxies-script-injection-jsonp-and-cors/


Comments

Post a Comment

Popular posts from this blog

python - pip install -U PySide error -

-
does know how avoid following error when running pip install -u pyside per official website instructions here: https://pypi.python.org/pypi/pyside/#installing-pyside-on-a-mac-os-x-system note have done brew install qt successfully. you using pip version 7.0.3, version 7.1.2 available. should consider upgrading via 'pip install --upgrade pip' command. collecting pyside using cached pyside-1.2.4.tar.gz installing collected packages: pyside running setup.py install pyside complete output command /applications/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-build-cpxemt/pyside/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-0r7hri-record/install-record.txt --single-version-externally-managed --compile:
Read more

arrays - C++ error: a brace-enclosed initializer is not allowed here before ‘{’ token -

-
simple question: i'm trying initialize array within c++ class declaration: using namespace std; #include <string> class myclass{ public: string myarray[] = {"a","b","c"}; }; and i'm getting error: error: brace-enclosed initializer not allowed here before ‘{’ token no, without complied c++11 compiler, cannot initialize member array in declaration. have initialize array member in constructor. , don't use open array if know number of elements initialize array.
Read more

cytoscape.js - How to add nodes to Dagre layout with Cytoscape -

-
i trying add nodes dagre graph through cityscape.js. problem nodes not painted. code have: cy.add({ group: "nodes", data: { id:"n0",name:"n0",weight: 75 }, }); $.ajax(url).done(function(jsontree){ var newnodes=[]; for(var i=1;i<6;i++){ //var child = jsontree.result[i]; newnodes.push( { group: "nodes", data: { id: "n"+i, name:"n"+i}}, { group: "edges", data: { id: "e"+i, source: "n0", target: "n"+i } } ); } cy.add(newnodes); any ideas? have used loaded function reload graph not work. not know if have use specific function reload graph. thank in advance. you need add positions new nodes. cytoscape.js docs : it important note positions of newly added nodes must defined when calling cy.add(). nodes can not placed in graph without valid position — otherwise not displayed. yo
Read more