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http_server1.py
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import socket
import sys
import os
def response_ok(body=b"This is a minimal response", mimetype=b"text/plain"):
"""
returns a basic HTTP response
Ex:
response_ok(
b"<html><h1>Welcome:</h1></html>",
b"text/html"
) ->
b'''
HTTP/1.1 200 OK\r\n
Content-Type: text/html\r\n
\r\n
<html><h1>Welcome:</h1></html>\r\n
'''
"""
return b"\r\n".join([
b"HTTP/1.1 200 OK",
b"Content-Type: " + mimetype,
b"",
body,
])
def parse_request(request):
method, uri, version = request.split("\r\n")[0].split(" ")
if method != "GET":
raise NotImplementedError
return uri
def response_method_not_allowed():
"""Returns a 405 Method Not Allowed response"""
return b"\r\n".join([
b"HTTP/1.1 405 Method Not Allowed",
b"",
b"You can't do that on this server!",
])
def response_not_found():
"""Returns a 404 Not Found response"""
# TODO: Construct and return a 404 "not found" response
# You can re-use most of the code from the 405 Method Not
# Allowed response.
pass
def resolve_uri(uri):
"""
This method should return appropriate content and a mime type.
If the requested URI is a directory, then the content should be a
plain-text listing of the contents with mimetype `text/plain`.
If the URI is a file, it should return the contents of that file
and its correct mimetype.
If the URI does not map to a real location, it should raise a
NameError that the server can catch to return a 404 response.
Ex:
resolve_uri('/a_web_page.html') -> (b"<html><h1>North Carolina...",
b"text/html")
resolve_uri('/images/sample_1.png')
-> (b"A12BCF...", # contents of sample_1.png
b"image/png")
resolve_uri('/') -> (b"images/, a_web_page.html, make_type.py,...",
b"text/plain")
resolve_uri('/a_page_that_doesnt_exist.html') -> Raises a NameError
"""
# TODO: Fill content and mime_type according to the function description
# above. If the provided URI does not correspdond to a real file or
# directory, then raise a NameError.
# Hint: When opening a file, use open(filename, "rb") to open and read the
# file as a stream of bytes.
content = b"not implemented"
mime_type = b"not implemented"
return content, mime_type
def server(log_buffer=sys.stderr):
address = ('0.0.0.0', int(os.environ.get('PORT', 10000)))
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print("making a server on {0}:{1}".format(*address), file=log_buffer)
sock.bind(address)
sock.listen(1)
try:
while True:
print('waiting for a connection', file=log_buffer)
conn, addr = sock.accept() # blocking
try:
print('connection - {0}:{1}'.format(*addr), file=log_buffer)
request = ''
while True:
data = conn.recv(1024)
request += data.decode('utf8')
#if len(data) < 1024:
# break
if b'\r\n\r\n' in data:
break
try:
uri = parse_request(request)
except NotImplementedError:
response = response_method_not_allowed()
else:
# TODO: resolve_uri will raise a NameError if the file
# specified by uri can't be found. If it does raise a
# NameError, then let response get response_not_found()
# instead of response_ok()
body, mimetype = resolve_uri(uri)
response = response_ok(body=body, mimetype=mimetype)
conn.sendall(response)
finally:
conn.close()
except KeyboardInterrupt:
sock.close()
return
if __name__ == '__main__':
server()
sys.exit(0)