Fix payload iteration issue of FormBody; Log form body; ignore body for response of HEAD.

examples/client_basics.cc

@@ -8,14 +8,18 @@ int main() {
 
   webcc::ClientSession session;
 
+  webcc::ResponsePtr r;
+
   try {
-    auto r = session.Request(webcc::RequestBuilder{}.
-                             Get("http://httpbin.org/get").
-                             Query("key1", "value1").
-                             Query("key2", "value2").
-                             Date().
-                             Header("Accept", "application/json")
-                             ());
+    r = session.Head("http://httpbin.org/get");
+
+    r = session.Request(webcc::RequestBuilder{}.
+                        Get("http://httpbin.org/get").
+                        Query("key1", "value1").
+                        Query("key2", "value2").
+                        Date().
+                        Header("Accept", "application/json")
+                        ());
 
     r = session.Get("http://httpbin.org/get",
                     { "key1", "value1", "key2", "value2" },

examples/file_upload_server.py

@@ -0,0 +1,37 @@
+# A demo HTTP file upload server modified from:
+#   http://flask.pocoo.org/docs/1.0/patterns/fileuploads/#uploading-files
+# Run:
+# (Windows)
+# $ set FLASK_APP=file_upload_server.py
+# $ flask 
+
+import os
+from flask import Flask, flash, request, redirect, url_for
+from flask import send_from_directory
+from werkzeug.utils import secure_filename
+
+
+UPLOAD_FOLDER = '/path/to/the/uploads'
+app = Flask(__name__)
+app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
+
+
+@app.route('/upload', methods=['POST'])
+def upload_file():
+    if request.method == 'POST':
+        for name, data in request.form.items():
+            print(f'form: {name}, {data}')
+
+        for name, file in request.files.items():
+            if file:
+                secured_filename = secure_filename(file.filename)
+                print(f"file:  {name}, {file.filename} ({secured_filename})")
+                file.save(os.path.join(app.config['UPLOAD_FOLDER'],
+                    secured_filename))
+
+        return "OK"
+
+
+@app.route('/uploads/<filename>')
+def uploaded_file(filename):
+    return send_from_directory(app.config['UPLOAD_FOLDER'], filename)