fix espressif#4071 (espressif#4072)

michael-betz · web-flow · commit fa8a1c38d504 · 2020-09-30T15:24:59.000+03:00
SPIFFS File object evaluates as true even if the file could not be opened.
diff --git a/libraries/WebServer/src/detail/RequestHandlersImpl.h b/libraries/WebServer/src/detail/RequestHandlersImpl.h
@@ -113,7 +113,7 @@ class StaticRequestHandler : public RequestHandler {
         }
 
         File f = _fs.open(path, "r");
-        if (!f)
+        if (!f || !f.available())
             return false;
 
         if (_cache_header.length() != 0)

Original file line number	Diff line number	Diff line change
`@@ -113,7 +113,7 @@ class StaticRequestHandler : public RequestHandler {`
`113`	`113`	`}`
`114`	`114`
`115`	`115`	`File f = _fs.open(path, "r");`
`116`		`- if (!f)`
	`116`	`+ if (!f \|\| !f.available())`
`117`	`117`	`return false;`
`118`	`118`
`119`	`119`	`if (_cache_header.length() != 0)`