added option `--server.hide-product-header`

CHANGELOG

@@ -1,6 +1,10 @@
 v2.8.0 (XXXX-XX-XX)
 -------------------
 
+* added startup option `--server.hide-product-header` to make the server not send
+  the HTTP response header `"Server: ArangoDB"` in its HTTP responses. By default,
+  the option is turned off so the header is still sent as usual.
+
 * added new AQL function `UNSET_RECURSIVE` to recursively unset attritutes from 
   objects/documents
 

Documentation/Books/Users/ConfigureArango/Arangod.mdpp

@@ -32,6 +32,10 @@
 @startDocuBlock serverDefaultApi
 
 
+!SUBSECTION Hide Product header
+@startDocuBlock serverHideProductHeader
+
+
 !SUBSECTION Allow method override
 @startDocuBlock serverAllowMethod
 

UnitTests/HttpInterface/api-http-spec.rb

@@ -156,7 +156,7 @@ describe ArangoDB do
 
         # run a HTTP HEAD query on the existing document, with wrong precondition
         cmd = "/_api/document/" + did
-        doc = ArangoDB.log_head("#{prefix}-head-check-documentq", cmd, :header => { :"if-match" => "1" })
+        doc = ArangoDB.log_head("#{prefix}-head-check-document", cmd, :header => { :"if-match" => "1" })
 
         doc.code.should eq(200)
         doc.response.body.should be_nil

arangod/RestServer/ArangoServer.cpp

@@ -601,6 +601,7 @@ void ArangoServer::buildApplicationServer () {
     ("server.allow-use-database", &ALLOW_USE_DATABASE_IN_REST_ACTIONS, "allow change of database in REST actions, only needed for unittests")
     ("server.threads", &_dispatcherThreads, "number of threads for basic operations")
     ("server.additional-threads", &_additionalThreads, "number of threads in additional queues")
+    ("server.hide-product-header", &HttpResponse::HideProductHeader, "do not expose \"Server: ArangoDB\" header in HTTP responses")
     ("server.foxx-queues", &_foxxQueues, "enable Foxx queues")
     ("server.foxx-queues-poll-interval", &_foxxQueuesPollInterval, "Foxx queue manager poll interval (in seconds)")
     ("server.session-timeout", &VocbaseContext::ServerSessionTtl, "timeout of web interface server sessions (in seconds)")

lib/Rest/HttpResponse.cpp

@@ -47,6 +47,12 @@ using namespace std;
 
 std::string const HttpResponse::BatchErrorHeader = "X-Arango-Errors";
 
+////////////////////////////////////////////////////////////////////////////////
+/// @brief hide header "Server: ArangoDB" in HTTP responses
+////////////////////////////////////////////////////////////////////////////////
+
+bool HttpResponse::HideProductHeader = false;
+
 ////////////////////////////////////////////////////////////////////////////////
 /// @brief http response string
 ////////////////////////////////////////////////////////////////////////////////
@@ -266,7 +272,9 @@ HttpResponse::HttpResponse (HttpResponseCode code,
     _bodySize(0),
     _freeables() {
 
+  if (! HideProductHeader) {
     _headers.insert(TRI_CHAR_LENGTH_PAIR("server"), "ArangoDB");
+  }
   _headers.insert(TRI_CHAR_LENGTH_PAIR("connection"), "Keep-Alive");
   _headers.insert(TRI_CHAR_LENGTH_PAIR("content-type"), "text/plain; charset=utf-8");
 }

lib/Rest/HttpResponse.h

@@ -453,6 +453,21 @@ namespace triagens {
 ////////////////////////////////////////////////////////////////////////////////
 
         static std::string const BatchErrorHeader;
+
+////////////////////////////////////////////////////////////////////////////////
+/// @brief hide the "Server: ArangoDB" header in HTTP responses
+/// @startDocuBlock serverHideProductHeader
+/// `--server.hide-product-header`
+///
+/// If *true*, the server will exclude the HTTP header "Server: ArangoDB" in
+/// HTTP responses. If set to *false*, the server will send the header in
+/// responses.
+///
+/// The default is *false*.
+/// @endDocuBlock
+////////////////////////////////////////////////////////////////////////////////
+        
+        static bool HideProductHeader;
     };
   }
 }