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Python's SimpleHTTPServer extended to handle HTTP/1.1 Range requests
import os
import SimpleHTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
class RangeHTTPRequestHandler(SimpleHTTPRequestHandler):
"""RangeHTTPRequestHandler is a SimpleHTTPRequestHandler
with HTTP 'Range' support"""
def send_head(self):
"""Common code for GET and HEAD commands.
Return value is either a file object or None
"""
path = self.translate_path(self.path)
ctype = self.guess_type(path)
# Handling file location
## If directory, let SimpleHTTPRequestHandler handle the request
if os.path.isdir(path):
return SimpleHTTPRequestHandler.send_head(self)
## Handle file not found
if not os.path.exists(path):
return self.send_error(404, self.responses.get(404)[0])
## Handle file request
f = open(path, 'rb')
fs = os.fstat(f.fileno())
size = fs[6]
# Parse range header
# Range headers look like 'bytes=500-1000'
start, end = 0, size-1
if 'Range' in self.headers:
start, end = self.headers.get('Range').strip().strip('bytes=').split('-')
if start == "":
## If no start, then the request is for last N bytes
## e.g. bytes=-500
try:
end = int(end)
except ValueError as e:
self.send_error(400, 'invalid range')
start = size-end
else:
try:
start = int(start)
except ValueError as e:
self.send_error(400, 'invalid range')
if start >= size:
# If requested start is greater than filesize
self.send_error(416, self.responses.get(416)[0])
if end == "":
## If only start is provided then serve till end
end = size-1
else:
try:
end = int(end)
except ValueError as e:
self.send_error(400, 'invalid range')
## Correct the values of start and end
start = max(start, 0)
end = min(end, size-1)
self.range = (start, end)
## Setup headers and response
l = end-start+1
if 'Range' in self.headers:
self.send_response(206)
else:
self.send_response(200)
self.send_header('Content-type', ctype)
self.send_header('Accept-Ranges', 'bytes')
self.send_header('Content-Range',
'bytes %s-%s/%s' % (start, end, size))
self.send_header('Content-Length', str(l))
self.send_header('Last-Modified', self.date_time_string(fs.st_mtime))
self.end_headers()
return f
def copyfile(self, infile, outfile):
"""Copies data between two file objects
If the current request is a 'Range' request then only the requested
bytes are copied.
Otherwise, the entire file is copied using SimpleHTTPServer.copyfile
"""
if not 'Range' in self.headers:
SimpleHTTPRequestHandler.copyfile(self, infile, outfile)
return
start, end = self.range
infile.seek(start)
bufsize=64*1024 ## 64KB
while True:
buf = infile.read(bufsize)
if not buf:
break
outfile.write(buf)
if __name__ == '__main__':
SimpleHTTPServer.test(HandlerClass=RangeHTTPRequestHandler)
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