Apex CALLOUT_REQUEST is failing with System.CalloutException: Read timed out
55528
How to set timeout for web service call
153748
Test Class for the Apex Class with try Catch block fails
7606
How do I unit test code that includes a callout?
108048
How can I make a PATCH HTTP Callout from Apex?
38443
ExecuteReader requires an open and available Connection. The connection's current state is closed
154124
Execute method within batch APEX not firing from test class
52995
Apex : CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY & SELF_REFERENCE_FROM_TRIGGER
3713
commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
125364
Execute method in Apex batch never called
13686
Apex Callout failed due to SunCertPathBuilderException
134794
APEX Dataloader fail INVALID_FIELD_FOR_INSERT_UPDATE, cannot specify Id in an insert call
135849
Callout - Unauthorized endpoint error
28205
How do I test asynchronous Apex?
3624
Apex errors with Custom button to add existing records on a custom object
40818
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
155344
Error - System.CalloutException: Received fatal alert: bad_record_mac
154861
solution for apex cpu time limit exceeded exception