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annotate webserver.py @ 4:54396f0323f4 draft

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planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
author fubar
date Tue, 09 Jan 2024 02:37:42 +0000
parents 2de9f585505b
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2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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1 #!/usr/bin/env python3
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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2
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3 # spec: simplest python web server with range support and multithreading that takes root path,
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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4 # port and bind address as command line arguments; by default uses the current dir as webroot,
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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5 # port 8000 and bind address of 0.0.0.0
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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6 # borrowed from https://github.com/danvk/RangeHTTPServer
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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7 # and reborrowed from https://gist.github.com/glowinthedark/b99900abe935e4ab4857314d647a9068
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8
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9
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10 import argparse
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11 import functools
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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12 import os
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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13 import re
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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14 import socketserver
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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15 import webbrowser
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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16 from http.server import SimpleHTTPRequestHandler
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19 DEFAULT_PORT = 8080
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22 def copy_byte_range(infile, outfile, start=None, stop=None, bufsize=16 * 1024):
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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23 """Like shutil.copyfileobj, but only copy a range of the streams.
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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24
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25 Both start and stop are inclusive.
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26 """
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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27 if start is not None:
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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28 infile.seek(start)
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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29 while 1:
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30 to_read = min(bufsize, stop + 1 - infile.tell() if stop else bufsize)
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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31 buf = infile.read(to_read)
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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32 if not buf:
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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33 break
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34 outfile.write(buf)
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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35
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36
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37 BYTE_RANGE_RE = re.compile(r"bytes=(\d+)-(\d+)?$")
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38
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39
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40 def parse_byte_range(byte_range):
2de9f585505b planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/jbrowse2 commit b30d2e277cc360437a02fa812c577c0c8d997cff-dirty
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41 """Returns the two numbers in 'bytes=123-456' or throws ValueError.
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42
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43 The last number or both numbers may be None.
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44 """
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45 if byte_range.strip() == "":
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46 return None, None
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47
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48 m = BYTE_RANGE_RE.match(byte_range)
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49 if not m:
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50 raise ValueError("Invalid byte range %s" % byte_range)
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51
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52 first, last = [x and int(x) for x in m.groups()]
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53 if last and last < first:
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54 raise ValueError("Invalid byte range %s" % byte_range)
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55 return first, last
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56
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57
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58 class RangeRequestHandler(SimpleHTTPRequestHandler):
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59 """Adds support for HTTP 'Range' requests to SimpleHTTPRequestHandler
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60
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61 The approach is to:
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62 - Override send_head to look for 'Range' and respond appropriately.
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63 - Override copyfile to only transmit a range when requested.
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64 """
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65
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66 def handle(self):
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67 try:
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68 SimpleHTTPRequestHandler.handle(self)
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69 except Exception:
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70 # ignored, thrown whenever the client aborts streaming (broken pipe)
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71 pass
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72
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73 def send_head(self):
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74 if "Range" not in self.headers:
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75 self.range = None
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76 return SimpleHTTPRequestHandler.send_head(self)
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77 try:
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78 self.range = parse_byte_range(self.headers["Range"])
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79 except ValueError:
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80 self.send_error(400, "Invalid byte range")
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81 return None
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82 first, last = self.range
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83
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84 # Mirroring SimpleHTTPServer.py here
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85 path = self.translate_path(self.path)
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86 f = None
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87 ctype = self.guess_type(path)
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88 try:
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89 f = open(path, "rb")
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90 except IOError:
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91 self.send_error(404, "File not found")
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92 return None
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93
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94 fs = os.fstat(f.fileno())
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95 file_len = fs[6]
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96 if first >= file_len:
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97 self.send_error(416, "Requested Range Not Satisfiable")
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98 return None
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99
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100 self.send_response(206)
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101 self.send_header("Content-type", ctype)
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102
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103 if last is None or last >= file_len:
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104 last = file_len - 1
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105 response_length = last - first + 1
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106
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107 self.send_header("Content-Range", "bytes %s-%s/%s" % (first, last, file_len))
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108 self.send_header("Content-Length", str(response_length))
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109 self.send_header("Last-Modified", self.date_time_string(fs.st_mtime))
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110 self.end_headers()
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111 return f
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112
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113 def end_headers(self):
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114 self.send_header("Accept-Ranges", "bytes")
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115 return SimpleHTTPRequestHandler.end_headers(self)
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116
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117 def copyfile(self, source, outputfile):
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118 if not self.range:
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119 return SimpleHTTPRequestHandler.copyfile(self, source, outputfile)
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120
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121 # SimpleHTTPRequestHandler uses shutil.copyfileobj, which doesn't let
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122 # you stop the copying before the end of the file.
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123 start, stop = self.range # set in send_head()
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124 copy_byte_range(source, outputfile, start, stop)
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125
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126
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127 class ThreadedTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
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128 allow_reuse_address = True
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129
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130
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131 if __name__ == "__main__":
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132 parser = argparse.ArgumentParser(
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133 description="Simple Python Web Server with Range Support"
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134 )
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135 parser.add_argument(
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136 "--root",
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137 default=os.getcwd(),
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138 help="Root path to serve files from (default: current working directory)",
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139 )
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140 parser.add_argument(
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141 "--port",
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142 type=int,
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143 default=DEFAULT_PORT,
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144 help=f"Port to listen on (default: {DEFAULT_PORT})",
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145 )
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146 parser.add_argument(
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147 "--bind", default="0.0.0.0", help="IP address to bind to (default: 0.0.0.0)"
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148 )
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149 args = parser.parse_args()
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150
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151 handler = functools.partial(RangeRequestHandler, directory=args.root)
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152
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153 webbrowser.open(f"http://{args.bind}:{args.port}")
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154
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155 with ThreadedTCPServer((args.bind, args.port), handler) as httpd:
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156 print(
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157 f"Serving HTTP on {args.bind} port {args.port} (http://{args.bind}:{args.port}/)"
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158 )
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159 httpd.serve_forever()