CRITICAL: WinHTTP POST missing Content-Type header (PSP payment fix)

Linux libcurl automatically sets Content-Type:
application/x-www-form-urlencoded when CURLOPT_POSTFIELDS is used.
Our WinHTTP stub did not. The PSP keepalive endpoint at
ipfs.digiassetx.com is an Express server using body-parser, which
SILENTLY DROPS the request body when no Content-Type header is
present.

So our keepalive POSTs were arriving with empty bodies — no
address, no peerId, no secret. The server saw an empty request
and returned "unsubscribe failed will time out anyways" (its
generic error for malformed/empty registrations).

Linux users with libcurl get paid because their POSTs include
the auto-set Content-Type header. Windows users on this port
got nothing because our minimal WinHTTP stub didn't replicate
this behavior.

Fix: in CurlHandler::post, add Content-Type:
application/x-www-form-urlencoded automatically when posting
form data, matching libcurl's behavior. Skip if user already
set a Content-Type header explicitly.

This affects ALL HTTP POSTs from the Windows build, not just PSP.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: chopperbriano

src/ConsoleDashboard.cpp

@@ -380,13 +380,13 @@ void ConsoleDashboard::render() {
         if (_pspStatus.find("reachable") != std::string::npos &&
             _pspStatus.find("unreachable") == std::string::npos) {
             out << FG_GREEN << _pspStatus << RESET;
-            if (_pspNodeCount > 0) {
-                out << "    Network: " << FG_BRIGHT_WHITE << _pspNodeCount
-                    << RESET << DIM << " nodes online" << RESET;
-            }
         } else {
             out << FG_YELLOW << _pspStatus << RESET;
         }
+        if (_pspNodeCount > 0) {
+            out << "    Network: " << FG_BRIGHT_WHITE << _pspNodeCount
+                << RESET << DIM << " nodes online" << RESET;
+        }
         out << "\n"; totalRows++;
     }
 

src/curl_stubs.cpp

@@ -264,6 +264,21 @@ CURLcode curl_easy_perform(CURL* easy_handle) {
         extraHeaders += utf8ToWide(encoded);
         extraHeaders += L"\r\n";
     }
+    // libcurl automatically sets Content-Type for POSTFIELDS — match that behavior.
+    // Without this, servers like Express body-parser silently drop the body.
+    if (h->isPost && !h->postFields.empty()) {
+        // Only add if user hasn't already provided one
+        bool hasContentType = false;
+        for (curl_slist* sl = h->headers; sl; sl = sl->next) {
+            std::string hdr(sl->data);
+            std::string lower;
+            for (char c : hdr) lower += (char)tolower(c);
+            if (lower.find("content-type:") == 0) { hasContentType = true; break; }
+        }
+        if (!hasContentType) {
+            extraHeaders += L"Content-Type: application/x-www-form-urlencoded\r\n";
+        }
+    }
 
     const void* postData    = h->isPost ? h->postFields.c_str() : nullptr;
     DWORD       postDataLen = h->isPost ? (DWORD)h->postFields.size() : 0;