def start_response(self, status, headers, exc_info=None):
"""'start_response()' callable as specified by PEP 333"""
if exc_info:
try:
if self.headers_sent:
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None
elif self.headers is not None:
raise AssertionError('Headers already set!')
raise type(status) is StringType or AssertionError(
'Status must be a string')
raise len(status) >= 4 or AssertionError(
'Status must be at least 4 characters')
raise int(status[:3]) or AssertionError(
'Status message must begin w/3-digit code')
raise status[3] == ' ' or AssertionError(
'Status message must have a space after code')
for name, val in headers:
raise type(name) is StringType or AssertionError(
'Header names must be strings')
raise type(val) is StringType or AssertionError(
'Header values must be strings')
raise not is_hop_by_hop(name) or AssertionError(
'Hop-by-hop headers not allowed')
self.status = status
self.headers = self.headers_class(headers)
return self.write
def start_response(self, status, headers,exc_info=None):
"""'start_response()' callable as specified by PEP 333"""
if exc_info:
try:
if self.headers_sent:
# Re-raise original exception if headers sent
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None # avoid dangling circular ref
elif self.headers is not None:
raise AssertionError("Headers already set!")
assert type(status) is StringType,"Status must be a string"
assert len(status)>=4,"Status must be at least 4 characters"
assert int(status[:3]),"Status message must begin w/3-digit code"
assert status[3]==" ", "Status message must have a space after code"
if __debug__:
for name,val in headers:
assert type(name) is StringType,"Header names must be strings"
assert type(val) is StringType,"Header values must be strings"
assert not is_hop_by_hop(name),"Hop-by-hop headers not allowed"
self.status = status
self.headers = self.headers_class(headers)
return self.write
def start_response(self, status, headers, exc_info=None):
"""'start_response()' callable as specified by PEP 333"""
if exc_info:
try:
if self.headers_sent:
# Re-raise original exception if headers sent
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None # avoid dangling circular ref
elif self.headers is not None:
raise AssertionError("Headers already set!")
assert type(status) is StringType, "Status must be a string"
assert len(status) >= 4, "Status must be at least 4 characters"
assert int(status[:3]), "Status message must begin w/3-digit code"
assert status[3] == " ", "Status message must have a space after code"
if __debug__:
for name, val in headers:
assert type(name) is StringType, "Header names must be strings"
assert type(val) is StringType, "Header values must be strings"
assert not is_hop_by_hop(
name), "Hop-by-hop headers not allowed"
self.status = status
self.headers = self.headers_class(headers)
return self.write
def start_response(self, status, headers, exc_info=None):
"""'start_response()' callable as specified by PEP 333"""
# M:
# exc_info:
# The exc_info argument, if supplied, must be a Python sys.exc_info()
# tuple. This argument should be supplied by the application only if
# start_response is being called by an error handler.
# exc_info is the most recent exception catch in except clause
# in error_output:
# start_response(
# self.error_status,self.error_headers[:],sys.exc_info())
# headers_sent:
# when send_headers is invoked, headers_sent = True
# when close is invoked, headers_sent = False
if exc_info:
try:
if self.headers_sent:
# Re-raise original exception if headers sent
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None # avoid dangling circular ref
elif self.headers is not None:
raise AssertionError("Headers already set!")
assert type(status) is StringType, "Status must be a string"
assert len(status) >= 4, "Status must be at least 4 characters"
assert int(status[:3]), "Status message must begin w/3-digit code"
assert status[3] == " ", "Status message must have a space after code"
if __debug__:
for name, val in headers:
assert type(name) is StringType, "Header names must be strings"
assert type(val) is StringType, "Header values must be strings"
assert not is_hop_by_hop(
name), "Hop-by-hop headers not allowed"
# M: set status and headers
self.status = status
# M:
# headers_class is Headers in module headers
self.headers = self.headers_class(headers)
return self.write
def start_response(self, status, headers,exc_info=None):
"""'start_response()' callable as specified by PEP 333"""
# M:
# exc_info:
# The exc_info argument, if supplied, must be a Python sys.exc_info()
# tuple. This argument should be supplied by the application only if
# start_response is being called by an error handler.
# exc_info is the most recent exception catch in except clause
# in error_output:
# start_response(
# self.error_status,self.error_headers[:],sys.exc_info())
# headers_sent:
# when send_headers is invoked, headers_sent = True
# when close is invoked, headers_sent = False
if exc_info:
try:
if self.headers_sent:
# Re-raise original exception if headers sent
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None # avoid dangling circular ref
elif self.headers is not None:
raise AssertionError("Headers already set!")
assert type(status) is StringType,"Status must be a string"
assert len(status)>=4,"Status must be at least 4 characters"
assert int(status[:3]),"Status message must begin w/3-digit code"
assert status[3]==" ", "Status message must have a space after code"
if __debug__:
for name,val in headers:
assert type(name) is StringType,"Header names must be strings"
assert type(val) is StringType,"Header values must be strings"
assert not is_hop_by_hop(name),"Hop-by-hop headers not allowed"
# M: set status and headers
self.status = status
# M:
# headers_class is Headers in module headers
self.headers = self.headers_class(headers)
return self.write
def start_response(self, status, headers, exc_info=None):
"""'start_response()' callable as specified by PEP 333"""
# 设置好头信息，返回write函数
#
# 三种错误：
# 1.若头还未设置，比如status出现错误的情景
#
# 2.若头已经设置好，发送数据(finish_response/write)时出现
# 问题，比如第一次data不符合类型，此时头还未发送
#
# 3.若头已通过设置并随第一次data发送,但第二次data有问题,
# handle_error处理不了，直接交给self.close
#
# ...
#
if exc_info: #错误处理如何进行？
try:
if self.headers_sent:
# Re-raise original exception if headers sent
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None # avoid dangling circular ref
elif self.headers is not None: # 多余吗？
raise AssertionError("Headers already set!")
assert type(status) is StringType, "Status must be a string"
assert len(status) >= 4, "Status must be at least 4 characters"
assert int(status[:3]), "Status message must begin w/3-digit code"
assert status[3] == " ", "Status message must have a space after code"
if __debug__: # 如何使用?
for name, val in headers:
assert type(name) is StringType, "Header names must be strings"
assert type(val) is StringType, "Header values must be strings"
assert not is_hop_by_hop(
name), "Hop-by-hop headers not allowed"
self.status = status
self.headers = self.headers_class(headers) # 设置好头信息
return self.write # 这样app里就可以捕获服务器端write函数并运用它了!!!!!
def start_response(self, status, headers, exc_info = None):
"""'start_response()' callable as specified by PEP 333"""
if exc_info:
try:
if self.headers_sent:
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None
elif self.headers is not None:
raise AssertionError('Headers already set!')
raise type(status) is StringType or AssertionError('Status must be a string')
raise len(status) >= 4 or AssertionError('Status must be at least 4 characters')
raise int(status[:3]) or AssertionError('Status message must begin w/3-digit code')
raise status[3] == ' ' or AssertionError('Status message must have a space after code')
for name, val in headers:
raise type(name) is StringType or AssertionError('Header names must be strings')
raise type(val) is StringType or AssertionError('Header values must be strings')
raise not is_hop_by_hop(name) or AssertionError('Hop-by-hop headers not allowed')
self.status = status
self.headers = self.headers_class(headers)
return self.write
