Hello, I am trying to Read From and Write To a Web API , as I am new to it

It sounds like you may have an error in an expression, possibly passing the wrong type as a parameter. Can you attach the expression?

Hi Tom ... here is the expression

load(
local!countIoGroupUrl: "count.io/.../",
local!count: bind(
get: a!fromJson(
jsonText: a!httpQuery(
url: local!countIoGroupUrl & "example"
).result.body
).count,
set: a!httpWrite(
url: _,
method: "POST"
)
),
a!dashboardLayout(
firstColumnContents: {
a!textField(
label: "Counter",
instructions: "Use the +1 and -1 buttons below to increase or decrease the counter above",
value: local!count,
readOnly: true
),
a!buttonLayout(
secondaryButtons: {
a!buttonWidget(
label: "- 1",
value: local!countIoGroupUrl & "example-",
saveInto: local!count
),
a!buttonWidget(
label: "+ 1",
value: local!countIoGroupUrl & "example+",
saveInto: local!count
)
}
)
}
)
)

It appears that count.io is currently not available. You will need to test with a different API.

I have created a sample API in my appian server it self and tried but still I get the same error...we are on cloud does that make any difference???

It should not. To rule out any issues with exposing the web service, it might be easier to try with an external API.

Tom, I am trying to work with a!httpWrite function as my requirement is to write back through an external API is there any way to do it ??

I have created a Web API with templates provided and while connecting the URL through a!httpQuery I am facing the below issue
Interface Definition: Not a valid component. Received: [success:false,result:,error:[code:[category:0,namespace:1,detail:0],title:HTTP error connecting to Test.appiancloud.com/.../1.1 401 Unauthorized,detail:No details available],@attributes:[@anyAttribute:[_dirty:false,_bannerText:,_refresh:]]]

while the URL is perfectly accessible in browser

Based on the Unauthorized error, it seems that you may not be supplying the correct credentials. It is most likely working through the browser because you already have an active session with the site. Another good way to test web service calls externally to Appian is with SoapUI: http://www.soapui.org/