you shouldnt need the standard lib for .net 4.5, just use framework targets

src/Shodan.Net/project.json

@@ -1,9 +1,8 @@
 {
-  "version": "0.1.0",
+  "version": "0.2.0",
   "authors": [ "Tommy Parnell" ],
 
   "dependencies": {
-    "NETStandard.Library": "1.5.0-rc2-24027",
     "Newtonsoft.Json": "8.0.3"
   },
   "frameworks": {
@@ -11,10 +10,16 @@
       "imports": "dnxcore50",
       "dependencies": {
         "System.Dynamic.Runtime": "4.0.11-rc2-24027",
-        "System.Runtime.Serialization.Primitives": "4.1.1-rc2-24027"
+        "System.Runtime.Serialization.Primitives": "4.1.1-rc2-24027",
+        "NETStandard.Library": "1.5.0-rc2-24027"
       }
     },
-    "net45": { "frameworkAssemblies": { "System.Runtime.Serialization": "4.0.0.0" } }
+    "net45": {
+      "frameworkAssemblies": {
+        "System.Runtime.Serialization": "4.0.0.0",
+        "System.Net.Http": "4.0.0.0"
+      }
+    }
   },
   "buildOptions": {
     "xmlDoc": false