diff --git a/src/httpserver.cpp b/src/httpserver.cpp
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -233,22 +233,30 @@
     }
     auto hreq = std::make_unique<HTTPRequest>(req);
 
-    LogPrint(BCLog::HTTP, "Received a %s request for %s from %s\n",
-             RequestMethodString(hreq->GetRequestMethod()), hreq->GetURI(),
-             hreq->GetPeer().ToString());
-
     // Early address-based allow check
     if (!ClientAllowed(hreq->GetPeer())) {
+        LogPrint(BCLog::HTTP,
+                 "HTTP request from %s rejected: Client network is not allowed "
+                 "RPC access\n",
+                 hreq->GetPeer().ToString());
         hreq->WriteReply(HTTP_FORBIDDEN);
         return;
     }
 
     // Early reject unknown HTTP methods
     if (hreq->GetRequestMethod() == HTTPRequest::UNKNOWN) {
+        LogPrint(BCLog::HTTP,
+                 "HTTP request from %s rejected: Unknown HTTP request method\n",
+                 hreq->GetPeer().ToString());
         hreq->WriteReply(HTTP_BADMETHOD);
         return;
     }
 
+    LogPrint(BCLog::HTTP, "Received a %s request for %s from %s\n",
+             RequestMethodString(hreq->GetRequestMethod()),
+             SanitizeString(hreq->GetURI(), SAFE_CHARS_URI).substr(0, 100),
+             hreq->GetPeer().ToString());
+
     // Find registered handler for prefix
     std::string strURI = hreq->GetURI();
     std::string path;
diff --git a/src/util/strencodings.h b/src/util/strencodings.h
--- a/src/util/strencodings.h
+++ b/src/util/strencodings.h
@@ -29,6 +29,8 @@
     SAFE_CHARS_UA_COMMENT,
     //! Chars allowed in filenames
     SAFE_CHARS_FILENAME,
+    //! Chars allowed in URIs (RFC 3986)
+    SAFE_CHARS_URI,
 };
 
 /**
diff --git a/src/util/strencodings.cpp b/src/util/strencodings.cpp
--- a/src/util/strencodings.cpp
+++ b/src/util/strencodings.cpp
@@ -23,6 +23,8 @@
     CHARS_ALPHA_NUM + " .,;-_?@",
     // SAFE_CHARS_FILENAME
     CHARS_ALPHA_NUM + ".-_",
+    // SAFE_CHARS_URI
+    CHARS_ALPHA_NUM + "!*'();:@&=+$,/?#[]-_.~%",
 };
 
 std::string SanitizeString(const std::string &str, int rule) {