[#437] dynamic value generation of option parseReqBody

README.md

@@ -407,6 +407,19 @@ app.use('/proxy', proxy('www.google.com', {
   parseReqBody: false
 }));
 ```
+You can use function instead of boolean value for dynamic value generation based on request
+
+```js
+app.use('/proxy', proxy('www.google.com', {
+  parseReqBody: function (proxyReq) {
+    if (proxyReq.headers["content-type"] === "application/json") {
+      return true;
+    } else {
+      return false;
+    }
+  }
+}));
+``` 
 
 #### reqAsBuffer
 

app/steps/buildProxyReq.js

@@ -9,7 +9,8 @@ function buildProxyReq(Container) {
   var options = Container.options;
   var host = Container.proxy.host;
 
-  var parseBody = (!options.parseReqBody) ? Promise.resolve(null) : requestOptions.bodyContent(req, res, options);
+  var parseReqBody = (typeof options.parseReqBody === 'function') ? options.parseReqBody(req) : options.parseReqBody;
+  var parseBody = (!parseReqBody) ? Promise.resolve(null) : requestOptions.bodyContent(req, res, options);
   var createReqOptions = requestOptions.create(req, res, options, host);
 
   return Promise

app/steps/sendProxyRequest.js

@@ -36,8 +36,9 @@ function sendProxyRequest(Container) {
 
     proxyReq.on('error', reject);
 
+    var parseReqBody = (typeof options.parseReqBody === 'function') ? options.parseReqBody(req) : options.parseReqBody;
     // this guy should go elsewhere, down the chain
-    if (options.parseReqBody) {
+    if (parseReqBody) {
     // We are parsing the body ourselves so we need to write the body content
     // and then manually end the request.
 

lib/requestOptions.js

@@ -86,6 +86,7 @@ function createRequestOptions(req, res, options) {
 
 function bodyContent(req, res, options) {
   var parseReqBody = isUnset(options.parseReqBody) ? true : options.parseReqBody;
+  parseReqBody = (typeof parseReqBody === 'function') ? parseReqBody(req) : options.parseReqBody;
 
   function maybeParseBody(req, limit) {
     if (req.body) {