diff --git a/api/src/controllers/internal/Execution.ts b/api/src/controllers/internal/Execution.ts
index 1beb046..b5594a6 100644
--- a/api/src/controllers/internal/Execution.ts
+++ b/api/src/controllers/internal/Execution.ts
@@ -89,6 +89,8 @@ export class ExecutionController {
       tokenFile,
       preProgramVariables?.httpHeaders.join('\n') ?? ''
     )
+    if (returnJson)
+      await createFile(headersPath, 'Content-type: application/json')
 
     await processProgram(
       program,
@@ -96,6 +98,7 @@ export class ExecutionController {
       vars,
       session,
       weboutPath,
+      headersPath,
       tokenFile,
       runTime,
       logPath,
diff --git a/api/src/controllers/internal/createJSProgram.ts b/api/src/controllers/internal/createJSProgram.ts
index c669ac5..5738a82 100644
--- a/api/src/controllers/internal/createJSProgram.ts
+++ b/api/src/controllers/internal/createJSProgram.ts
@@ -9,6 +9,7 @@ export const createJSProgram = async (
   vars: ExecutionVars,
   session: Session,
   weboutPath: string,
+  headersPath: string,
   tokenFile: string,
   otherArgs?: any
 ) => {
@@ -23,15 +24,16 @@ let _webout = '';
 const weboutPath = '${
     isWindows() ? weboutPath.replace(/\\/g, '\\\\') : weboutPath
   }'; 
-const _sasjs_tokenfile = '${
+const _SASJS_TOKENFILE = '${
     isWindows() ? tokenFile.replace(/\\/g, '\\\\') : tokenFile
   }';
-const _sasjs_username = '${preProgramVariables?.username}';
-const _sasjs_userid = '${preProgramVariables?.userId}';
-const _sasjs_displayname = '${preProgramVariables?.displayName}';
-const _metaperson = _sasjs_displayname;
-const _metauser = _sasjs_username;
-const sasjsprocessmode = 'Stored Program';
+const _SASJS_WEBOUT_HEADERS = '${headersPath}';
+const _SASJS_USERNAME = '${preProgramVariables?.username}';
+const _SASJS_USERID = '${preProgramVariables?.userId}';
+const _SASJS_DISPLAYNAME = '${preProgramVariables?.displayName}';
+const _METAPERSON = _SASJS_DISPLAYNAME;
+const _METAUSER = _SASJS_USERNAME;
+const SASJSPROCESSMODE = 'Stored Program';
 `
 
   const requiredModules = `const fs = require('fs')`
diff --git a/api/src/controllers/internal/createPythonProgram.ts b/api/src/controllers/internal/createPythonProgram.ts
index 497ab27..892ed14 100644
--- a/api/src/controllers/internal/createPythonProgram.ts
+++ b/api/src/controllers/internal/createPythonProgram.ts
@@ -9,6 +9,7 @@ export const createPythonProgram = async (
   vars: ExecutionVars,
   session: Session,
   weboutPath: string,
+  headersPath: string,
   tokenFile: string,
   otherArgs?: any
 ) => {
@@ -22,6 +23,7 @@ _SASJS_SESSION_PATH = '${
     isWindows() ? session.path.replace(/\\/g, '\\\\') : session.path
   }';
 _WEBOUT = '${isWindows() ? weboutPath.replace(/\\/g, '\\\\') : weboutPath}'; 
+_SASJS_WEBOUT_HEADERS = '${headersPath}';
 _SASJS_TOKENFILE = '${
     isWindows() ? tokenFile.replace(/\\/g, '\\\\') : tokenFile
   }';
diff --git a/api/src/controllers/internal/processProgram.ts b/api/src/controllers/internal/processProgram.ts
index 9f541c7..db2db10 100644
--- a/api/src/controllers/internal/processProgram.ts
+++ b/api/src/controllers/internal/processProgram.ts
@@ -18,6 +18,7 @@ export const processProgram = async (
   vars: ExecutionVars,
   session: Session,
   weboutPath: string,
+  headersPath: string,
   tokenFile: string,
   runTime: RunTimeType,
   logPath: string,
@@ -30,6 +31,7 @@ export const processProgram = async (
       vars,
       session,
       weboutPath,
+      headersPath,
       tokenFile,
       otherArgs
     )
@@ -66,6 +68,7 @@ export const processProgram = async (
       vars,
       session,
       weboutPath,
+      headersPath,
       tokenFile,
       otherArgs
     )
diff --git a/api/src/routes/api/spec/stp.spec.ts b/api/src/routes/api/spec/stp.spec.ts
index 9b05b98..7304a4f 100644
--- a/api/src/routes/api/spec/stp.spec.ts
+++ b/api/src/routes/api/spec/stp.spec.ts
@@ -450,6 +450,7 @@ const makeRequestAndAssert = async (
       expect.anything(),
       expect.anything(),
       expect.anything(),
+      expect.anything(),
       expectedRuntime,
       expect.anything(),
       undefined