Use HTTP method table from ESP-IDF's nghttp (#4900)

Fixes: #4884

* Use HTTP method table from ESP-IDF's nghttp
* Parse methods using IDF's HTTP method list
* Make example's loops to allow the CPU to switch tasks

libraries/WebServer/examples/AdvancedWebServer/AdvancedWebServer.ino

@@ -125,6 +125,7 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }
 
 void drawGraph() {

libraries/WebServer/examples/FSBrowser/FSBrowser.ino

@@ -300,4 +300,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/HelloServer/HelloServer.ino

@@ -70,4 +70,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/HttpAdvancedAuth/HttpAdvancedAuth.ino

@@ -56,4 +56,5 @@ void setup() {
 void loop() {
   ArduinoOTA.handle();
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/HttpBasicAuth/HttpBasicAuth.ino

@@ -38,4 +38,5 @@ void setup() {
 void loop() {
   ArduinoOTA.handle();
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/PathArgServer/PathArgServer.ino

@@ -53,4 +53,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/SDWebServer/SDWebServer.ino

@@ -310,4 +310,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/SimpleAuthentification/SimpleAuthentification.ino

@@ -129,4 +129,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/WebUpdate/WebUpdate.ino

@@ -65,5 +65,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
-  delay(1);
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/src/HTTP_Method.h

@@ -1,15 +1,9 @@
 #ifndef _HTTP_Method_H_
 #define _HTTP_Method_H_
 
-typedef enum {
-  HTTP_GET     = 0b00000001,
-  HTTP_POST    = 0b00000010,
-  HTTP_DELETE  = 0b00000100,
-  HTTP_PUT     = 0b00001000,
-  HTTP_PATCH   = 0b00010000,
-  HTTP_HEAD    = 0b00100000,
-  HTTP_OPTIONS = 0b01000000,
-  HTTP_ANY     = 0b01111111,
-} HTTPMethod;
+#include "http_parser.h"
+
+typedef enum http_method HTTPMethod;
+#define HTTP_ANY (HTTPMethod)(255)
 
 #endif /* _HTTP_Method_H_ */

libraries/WebServer/src/Parsing.cpp

@@ -30,6 +30,14 @@
 #define WEBSERVER_MAX_POST_ARGS 32
 #endif
 
+#define __STR(a) #a
+#define _STR(a) __STR(a)
+const char * _http_method_str[] = {
+#define XX(num, name, string) _STR(name),
+  HTTP_METHOD_MAP(XX)
+#undef XX
+};
+
 static const char Content_Type[] PROGMEM = "Content-Type";
 static const char filename[] PROGMEM = "filename";
 
@@ -96,17 +104,17 @@ bool WebServer::_parseRequest(WiFiClient& client) {
   _currentUri = url;
   _chunked = false;
 
-  HTTPMethod method = HTTP_GET;
-  if (methodStr == F("POST")) {
-    method = HTTP_POST;
-  } else if (methodStr == F("DELETE")) {
-    method = HTTP_DELETE;
-  } else if (methodStr == F("OPTIONS")) {
-    method = HTTP_OPTIONS;
-  } else if (methodStr == F("PUT")) {
-    method = HTTP_PUT;
-  } else if (methodStr == F("PATCH")) {
-    method = HTTP_PATCH;
+  HTTPMethod method = HTTP_ANY;
+  size_t num_methods = sizeof(_http_method_str) / sizeof(const char *);
+  for (size_t i=0; i<num_methods; i++) {
+    if (methodStr == _http_method_str[i]) {
+      method = (HTTPMethod)i;
+      break;
+    }
+  }
+  if (method == HTTP_ANY) {
+    log_e("Unknown HTTP Method: %s", methodStr.c_str());
+    return false;
   }
   _currentMethod = method;