Revise HttpRequestFunctionConfiguration configuration (#295)

Fixes #286

applications/processor/http-request-processor/README.adoc

@@ -43,14 +43,23 @@ The **$$http-request$$** $$processor$$ has the following options:
 == Options
 
 //tag::configuration-properties[]
-$$http.request.body-expression$$:: $$A SpEL expression to derive the request body from the incoming message.$$ *($$Expression$$, default: `$$<none>$$`)*
-$$http.request.expected-response-type$$:: $$The type used to interpret the response.$$ *($$Class<?>$$, default: `$$<none>$$`)*
-$$http.request.headers-expression$$:: $$A SpEL expression used to derive the http headers map to use.$$ *($$Expression$$, default: `$$<none>$$`)*
-$$http.request.http-method-expression$$:: $$A SpEL expression to derive the request method from the incoming message.$$ *($$Expression$$, default: `$$<none>$$`)*
-$$http.request.maximum-buffer-size$$:: $$Maximum buffer size in bytes allocated for input stream buffers. Defaults to 256k. Increase, as necessary, for posting or getting large binary content.$$ *($$Integer$$, default: `$$0$$`)*
-$$http.request.reply-expression$$:: $$A SpEL expression used to compute the final result, applied against the whole http {@link org.springframework.http.ResponseEntity}.$$ *($$Expression$$, default: `$$<none>$$`)*
-$$http.request.timeout$$:: $$Request timeout in milliseconds.$$ *($$Long$$, default: `$$30000$$`)*
-$$http.request.url-expression$$:: $$A SpEL expression against incoming message to determine the URL to use.$$ *($$Expression$$, default: `$$<none>$$`)*
+Properties grouped by prefix:
+
+
+=== http.request
+
+$$body-expression$$:: $$A SpEL expression to derive the request body from the incoming message.$$ *($$Expression$$, default: `$$<none>$$`)*
+$$expected-response-type$$:: $$The type used to interpret the response.$$ *($$Class<?>$$, default: `$$<none>$$`)*
+$$headers-expression$$:: $$A SpEL expression used to derive the http headers map to use.$$ *($$Expression$$, default: `$$<none>$$`)*
+$$http-method-expression$$:: $$A SpEL expression to derive the request method from the incoming message.$$ *($$Expression$$, default: `$$<none>$$`)*
+$$reply-expression$$:: $$A SpEL expression used to compute the final result, applied against the whole http {@link org.springframework.http.ResponseEntity}.$$ *($$Expression$$, default: `$$<none>$$`)*
+$$timeout$$:: $$Request timeout in milliseconds.$$ *($$Long$$, default: `$$30000$$`)*
+$$url-expression$$:: $$A SpEL expression against incoming message to determine the URL to use.$$ *($$Expression$$, default: `$$<none>$$`)*
+
+=== spring.codec
+
+$$log-request-details$$:: $$Whether to log form data at DEBUG level, and headers at TRACE level.$$ *($$Boolean$$, default: `$$false$$`)*
+$$max-in-memory-size$$:: $$Limit on the number of bytes that can be buffered whenever the input stream needs to be aggregated. This applies only to the auto-configured WebFlux server and WebClient instances. By default this is not set, in which case individual codec defaults apply. Most codecs are limited to 256K by default.$$ *($$DataSize$$, default: `$$<none>$$`)*
 //end::configuration-properties[]
 
 //end::ref-doc[]

applications/processor/http-request-processor/src/main/resources/META-INF/dataflow-configuration-metadata-whitelist.properties

@@ -1,2 +1,2 @@
-configuration-properties.classes=org.springframework.cloud.fn.http.request.HttpRequestFunctionProperties
-
+configuration-properties.classes=org.springframework.cloud.fn.http.request.HttpRequestFunctionProperties,\
+  org.springframework.boot.autoconfigure.codec.CodecProperties

applications/processor/http-request-processor/src/main/resources/META-INF/dataflow-configuration-metadata.properties

@@ -1,2 +1,3 @@
-configuration-properties.classes=org.springframework.cloud.fn.http.request.HttpRequestFunctionProperties
+configuration-properties.classes=org.springframework.cloud.fn.http.request.HttpRequestFunctionProperties,\
+  org.springframework.boot.autoconfigure.codec.CodecProperties