can read from html forms now. Added simple html page to submit isbn to lookup.

index.html

@@ -0,0 +1,5 @@
+<form action="http://127.0.0.1:8000/lookup" method="POST">
+    <label for="isbn">    </label>
+    <input name="isbn" id="isbn" value=" ">
+    <button>Submit</button>
+</form>

main.py

@@ -1,4 +1,4 @@
-from fastapi import FastAPI
+from fastapi import FastAPI, Form
 from isbnlib import meta
 
 app = FastAPI()
@@ -19,7 +19,7 @@ async  def checkout(isbn):
     return{"Checked Out": isbn}
 
 
-@app.put('/lookup/{isbn}')
-async  def lookup(isbn):
-    info = meta(str(isbn), service='wiki')
+@app.post('/lookup')
+async def lookup(isbn: str = Form(...)):
+    info = meta(isbn, service='wiki')
     return{"Title": info['Title']}