Not Allowed | 405

"I’d like to this letter into the library's collection," Eli said, sliding a sealed envelope toward the slot.

For a quick technical breakdown of why this error happens in the real world, check out this summary: 405 Not Allowed

The clerk pointed to a small plaque on the wall—the . It listed the only "verbs" the building accepted: GET, HEAD, OPTIONS . "I’d like to this letter into the library's

"If you want to leave something," the clerk explained, "you need to go to the . That building accepts the POST method. Here, we only let people look." "If you want to leave something," the clerk

In the bustling city of Silicon Circuit, every citizen is a and every building is a Server .

"I don't understand," Eli said. "Is the library closed? Is the address wrong?"

"The library is right here," the clerk droned, pointing to the shelves of books behind him. "You’ve got the right place. But this is an . It is a read-only establishment. You can GET a book, you can HEAD a title, but you cannot POST a letter here. We simply don't allow that method of interaction." "But I have to leave this letter!" Eli insisted.