You configure a request and reply call with an HTTP adapter.

In SAP Cloud Integration, the HTTP adapter is used for synchronous (request-reply) calls to external systems, and URLs can include dynamic variables using the Simple Expression Language. Let’s dive in:

Step 1: Understand Simple Expression Language- This language allows dynamic content in iFlow configurations, such as accessing properties or headers in URLs. The syntax is critical.

Step 2: Syntax Analysis-

${property.item}: This is the standard syntax for Simple Expression Language in SAP Cloud Integration, where ${} encloses the property name (e.g., item stored in exchange properties).

$(property.item): Parentheses are not part of the official syntax for Simple Expressions in SAP.

$[property.item]: Square brackets are incorrect; SAP uses curly braces.

#{property.item}: The # symbol is used in some other expression languages (e.g., Spring EL), not SAP’s Simple Expression.

Step 3: Use Case- In an HTTP adapter, you might configure a URL like http://example.com/api/${property.item}, where item is a property set earlier in the iFlow (e.g., via a Content Modifier).

Step 4: Official Verification- The SAP Help Portal’s "Simple Expression Language" documentation explicitly states that ${} is the correct syntax for accessing properties in adapter configurations, including HTTP adapters.

Conclusion: Option A (${property.item}) is the verified correct syntax.References:

SAP Help Portal: "Simple Expression Language" (SAP Cloud Integration)

SAP Help Portal: "Configuring HTTP Receiver Adapter"