move to new skeleton

tutorials/http/http-proxy-client/Makefile

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+PROG ?= example                   # Program we are building
+DELETE = rm -rf                   # Command to remove files
+OUT ?= -o $(PROG)                 # Compiler argument for output file
+SOURCES = main.c mongoose.c  packed_fs.c      # Source code files, packed_fs.c contains ca.pem, which contains CA certs for TLS
+CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+
+# Mongoose build options. See https://mongoose.ws/documentation/#build-options
+CFLAGS_MONGOOSE += -DMG_ENABLE_LINES=1 -DMG_ENABLE_PACKED_FS=1
+
+# See tutorial at https://mongoose.ws/tutorials/http-proxy-client/
+ARGS ?= 167.235.63.238:3128 http://info.cern.ch/	# default call arguments
+
+ifeq ($(OS),Windows_NT)   # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD OUT=/Feprog.exe
+  PROG ?= example.exe           # Use .exe suffix for the binary
+  CC = gcc                      # Use MinGW gcc compiler
+  CFLAGS += -lws2_32            # Link against Winsock library
+  DELETE = cmd /C del /Q /F /S  # Command prompt command to delete files
+  OUT ?= -o $(PROG)             # Build output
+  MAKE += WINDOWS=1 CC=$(CC)
+endif
+
+all: $(PROG)              # Default target. Build and run program
+	$(RUN) ./$(PROG) $(ARGS)
+
+$(PROG): $(SOURCES)       # Build program from sources
+	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) $(OUT)
+
+clean:                    # Cleanup. Delete built program and all build artifacts
+	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM mbedtls
+
+# see https://mongoose.ws/tutorials/tls/#how-to-build for TLS build options
+
+mbedtls:                  # Pull and build mbedTLS library
+	git clone --depth 1 -b v2.28.2 https://github.com/mbed-tls/mbedtls $@
+	$(MAKE) -C mbedtls/library

tutorials/http/http-proxy-client/README.md

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+See detailed tutorial at https://mongoose.ws/tutorials/http/http-proxy-client/ 

tutorials/http/http-proxy-client/main.c

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+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+//
+// Example HTTP client that uses a proxy server. Usage:
+//    make
+//    ./example PROXY:PORT http://www.ladyada.net
+//
+// To enable SSL/TLS, see https://mongoose.ws/tutorials/tls/#how-to-build
+//
+#include "mongoose.h"
+
+// Print HTTP response and signal that we're done
+static void fn(struct mg_connection *c, int ev, void *ev_data) {
+  const char *url = c->fn_data;
+  static bool connected;
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    printf("%.*s", (int) hm->message.len, hm->message.buf);
+    exit(EXIT_SUCCESS);
+  } else if (ev == MG_EV_CONNECT) {
+    // Proxy TCP connection established. Send CONNECT request
+    struct mg_str host = mg_url_host(url);
+
+    if (mg_url_is_ssl(url)) {
+      struct mg_tls_opts opts = {.ca = mg_unpacked("/certs/ca.pem"),
+                                 .name = host};
+      mg_tls_init(c, &opts);
+    }
+
+    // c->is_hexdumping = 1;
+    mg_printf(c, "CONNECT %.*s:%hu HTTP/1.1\r\nHost: %.*s:%hu\r\n\r\n",
+              (int) host.len, host.buf, mg_url_port(url), (int) host.len,
+              host.buf, mg_url_port(url));
+  } else if (!connected && ev == MG_EV_READ) {
+    struct mg_http_message hm;
+    int n = mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+    if (n > 0) {
+      struct mg_str host = mg_url_host(url);
+      // CONNECT response - tunnel is established
+      connected = true;
+      MG_DEBUG(
+          ("Connected to proxy, status: %.*s", (int) hm.uri.len, hm.uri.buf));
+      mg_iobuf_del(&c->recv, 0, n);
+      // Send request to the target server
+      mg_printf(c,
+                "GET %s HTTP/1.0\r\n"
+                "Host: %.*s\r\n"
+                "\r\n",
+                mg_url_uri(url), (int) host.len, host.buf);
+    }
+  }
+}
+
+int main(int argc, char *argv[]) {
+  struct mg_mgr mgr;
+
+  if (argc != 3) {
+    fprintf(stderr, "Usage: %s PROXY_URL URL\n", argv[0]);
+    return EXIT_FAILURE;
+  }
+
+  mg_mgr_init(&mgr);                            // Initialise event manager
+  mg_http_connect(&mgr, argv[1], fn, argv[2]);  // Connect to the proxy
+  for (;;) mg_mgr_poll(&mgr, 1000);             // Event loop
+  mg_mgr_free(&mgr);
+
+  return 0;
+}

tutorials/http/http-proxy-client/mongoose.c

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+../../../mongoose.c

tutorials/http/http-proxy-client/mongoose.h

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+../../../mongoose.h

tutorials/http/http-proxy-client/packed_fs.c

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+../http-client/packed_fs.c