rgw: send 100-continue response only if requested

src/rgw/rgw_common.h

@@ -164,6 +164,7 @@ struct req_state {
    const char *content_type;
    bool err_exist;
    struct rgw_err err;
+   bool expect_cont;
 
    XMLArgs args;
 

src/rgw/rgw_main.cc

@@ -275,7 +275,8 @@ int main(int argc, char *argv[])
       abort_early(&s, ret);
       continue;
     }
-    dump_continue(&s);
+    if (s.expect_cont)
+      dump_continue(&s);
 
     RGWOp *op = rgwhandler.get_op();
     if (op) {

src/rgw/rgw_op.cc

@@ -712,6 +712,7 @@ void RGWHandler::init_state(struct req_state *s, struct fcgx_state *fcgx)
      s->acl = new RGWAccessControlPolicy;
   }
   s->canned_acl.clear();
+  s->expect_cont = false;
 
   provider_init_state();
 }

src/rgw/rgw_rest.cc

@@ -648,6 +648,9 @@ void RGWHandler_REST::provider_init_state()
 
   s->copy_source = FCGX_GetParam("HTTP_X_AMZ_COPY_SOURCE", s->fcgx->envp);
   s->http_auth = FCGX_GetParam("HTTP_AUTHORIZATION", s->fcgx->envp);
+
+  const char *expect = FCGX_GetParam("HTTP_EXPECT", s->fcgx->envp);
+  s->expect_cont = (expect && !strcasecmp(expect, "100-continue"));
 }
 
 static bool is_acl_op(struct req_state *s)

src/rgw/rgw_rest.h

@@ -115,6 +115,8 @@ class RGWHandler_REST : public RGWHandler {
   RGWOp *get_create_op(struct req_state *s);
   RGWOp *get_delete_op(struct req_state *s);
 
+  bool expect100cont;
+
 protected:
   void provider_init_state();
 public: