Apex Callouts in Read-Only Mode

let’s understand how to handler the apex callouts during the salesforce read-only mode.During read-only mode, Apex callouts to external services execute and aren’t blocked by the system. Typically, you might execute some follow-up operations in the same transaction after receiving a response from a callout. For example, you might make a DML call to update a Salesforce record. But write operations in Salesforce, such as record updates, are blocked during read-only mode. Instance refreshes result in periods of read-only mode to facilitate infrastructure upgrades. Another is site switches. Continuous site switching enables Salesforce to improve our operations and infrastructure and meet the compliance requirement of many of our customers. Planned instance refreshes and site switches will put your Salesforce org in read-only mode for a portion of your preferred maintenance windows. To check whether the org is in read-only mode, call  System.getApplicationReadWriteMode(). The following example checks the return value of System.getApplicationReadWriteMode(). If the return value is equal to ApplicationReadWriteMode.READ_ONLY enum value, the org is in read-only mode and the callout is skipped. Otherwise (ApplicationReadWriteMode.DEFAULT value), the callout is performed.

To test read-only mode in the sandbox, contact Salesforce to enable the read-only mode test option. Once the test option is enabled, you can toggle read-only mode on and verify your apps. Here is the  code

public class AccountMatchReadOnly {
    public class MyReadOnlyException extends Exception {}
    public void getCalloutResponseContents(List<Account> acc) {
        // Get Read-only mode status
        ApplicationReadWriteMode mode = System.getApplicationReadWriteMode();
        if (mode == ApplicationReadWriteMode.READ_ONLY) {
            // Prevent the callout
            throw new MyReadOnlyException('Read-only mode. Skipping callouts!');
        } else if (mode == ApplicationReadWriteMode.DEFAULT) {
            // Instantiate a new http object
            for(Account a :acc){
                String addStr = EncodingUtil.urlEncode(a.BillingStreet+','+a.BillingCity+','+a.BillingCountry , 'UTF-8');
                Http h = new Http();
                HttpRequest request = new HttpRequest();
                HttpResponse response = h.send(request);
                if (response.getStatusCode() == 200) {
                    Map<String, Object> results = (Map<String, Object>) JSON.deserializeUntyped(response.getBody());
                    Boolean isMatched =(Boolean) results.get('matched') ; 
                        a.Verification_Status__c = 'Completed' ;
                        // update a ; 
                        a.Verification_Status__c = 'Pending' ;
                        //  update a ;     
            update acc ;



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