protocols

问题 I'm trying to connect to an rabbitMQ server but the it keeps failing on connection with a socket.error: protocol not found error. In [1]: import pika In [2]: pika.BlockingConnection(pika.ConnectionParameters('ip_of_server')) with error output of --------------------------------------------------------------------------- error Traceback (most recent call last) <ipython-input-2-7adc44418966> in <module>() ----> 1 pika.BlockingConnection(pika.ConnectionParameters('localhost') 2 ) /usr/lib

问题 I have a live video chat application and I use a TURN server which supports STUN/TURN and both UPD/TCP transmission. Sometimes users can be connected to the network which blocks that much ports and protocols that WebRTC connection just cannot happen (usually those are corporate networks). I would like to check if a WebRTC connection is possible before users try to connect to each other (actually, perform a technical check ). How can I do it? Ideas I have in my head: Try to download a hosted

问题 I need to generate and STP traffic using scapy and when I visualize it via wireshark I get an output similar to the caption shown below: when I run this code: from scapy.all import STP import scapy from scapy.all import * data='STP' sendp(Ether(dst="01:80:c2:00:00:00")/LLC(dsap=0xaa, ssap=0xaa)/STP(bpdutype=0x00, bpduflags=0x01, portid=0x8002)/data, iface="eth1", count=200) this is my wireshark output I don't know how to change the organization code to 00:00:0c, because I believe it's the one

问题 I am trying to build my own Form builder. It was going well until the point when I wanted to get a Value from a Cell . I wanted to make it generic as possible, for instance some Cell s could be responsible of ValueType of Int and others could be String . Anyways, my all Cell s basically conforms to protocol called BaseCell . I assigned a associatedType to this protocol and added a variable value which would return different types for each Cell . After some tryings I come with with the

问题 Im trying to figure out which is the maximum size of a RTP packet. I know that the minimum header size is 12 bytes, but i dont find anything about the payload. It is possible that the maximum size of the RTP packet is the same as the UDP payload maximum size? I mean, that i have only a RTP packet with a huge payload. Is this possible and, in this case, there is any recommended size for the RTP packet for not doing this? For example im encapsulating MP3 frames in RTP. Do I make an RTP frame

问题 Im trying to figure out which is the maximum size of a RTP packet. I know that the minimum header size is 12 bytes, but i dont find anything about the payload. It is possible that the maximum size of the RTP packet is the same as the UDP payload maximum size? I mean, that i have only a RTP packet with a huge payload. Is this possible and, in this case, there is any recommended size for the RTP packet for not doing this? For example im encapsulating MP3 frames in RTP. Do I make an RTP frame

问题 After looking at the NNTP standard, I have figured out how to extract a header from the message, how to fold headers, and how to separate the header label from the header text. What I can't find is an official list of standard NNTP headers. The standard lists Subject, From, Date, Message-id, Reference but not Groups which I know needs to be there. Is there an official list of all the official NNTP headers? For bonus marks, is there a list of commonly-used, unofficial headers? EDIT I found the

问题 Im trying to figure out which is the maximum size of a RTP packet. I know that the minimum header size is 12 bytes, but i dont find anything about the payload. It is possible that the maximum size of the RTP packet is the same as the UDP payload maximum size? I mean, that i have only a RTP packet with a huge payload. Is this possible and, in this case, there is any recommended size for the RTP packet for not doing this? For example im encapsulating MP3 frames in RTP. Do I make an RTP frame

问题 I have a ViewController, this view container has a class which creates 2 container views, and adds a table to the first container and a HashtagPicker for the second. The hashTagPicker has a function which is called whenever a change to the selected hashTags happens. question : i want to call a update table function whenever a tag is changed. How can i call a function from the hashtagclass which is defined in the class that contains the containers? 回答1: I personally like the delegate approach

问题 about websocket protocal ,you can read the detail from here,http://tools.ietf.org/html/rfc6455#section-5.3 in the mask section ,it said: The masking key is a 32-bit value chosen at random by the client. When preparing a masked frame, the client MUST pick a fresh masking key from the set of allowed 32-bit values. The masking key needs to be unpredictable; thus, the masking key MUST be derived from a strong source of entropy, and the masking key for a given frame MUST NOT make it simple for a