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How big can a user agent string get?
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HTTP specification does not limit length of headers at all.
However web-servers do limit header size they accept, throwing 413 Entity Too Large if it exceeds.
Depending on web-server and their settings these limits vary from 4KB to 64...
How to make HTML table cell editable?
...e one of the following values:
true or the empty string, which indicates that the element must be editable;
false, which indicates that the element must not be editable.
If this attribute is not set, its default value is inherited from its
parent element.
This attribute is a...
What is the easiest way to duplicate an activerecord record?
... suppose you have a task scheduled for a certain date and you want to duplicate it to another date. The actual attributes of the task aren't important, so:
old_task = Task.find(task_id)
new_task = Task.new(old_task.attributes.merge({:scheduled_on => some_new_date}))
will create a new task wit...
Setting the correct encoding when piping stdout in Python
... because Python encodes the output to whatever encoding your terminal application is using. If you are piping you must encode it yourself.
A rule of thumb is: Always use Unicode internally. Decode what you receive, and encode what you send.
# -*- coding: utf-8 -*-
print u"åäö".encode('utf-8')
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How to move screen without moving cursor in Vim?
... point I've accepted it. If you want to go down that road, there's xev -q, cat /proc/bus/input/devices to find the device to query and evtest or thd ... --dump /dev/input/event<#> to check the state, etc. If you absolutely must make a system-wide remapping, at least swap two locks like caps &l...
Using sed, how do you print the first 'N' characters of a line?
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colrm x
For example, if you need the first 100 characters:
cat file |colrm 101
It's been around for years and is in most linux's and bsd's (freebsd for sure), usually by default. I can't remember ever having to type apt-get install colrm.
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Determine if a function exists in bash
...hich is somewhat inefficient). Would you check if a file is present using cat "$fn" | wc -c? As for zsh, if the bash tag didn't clue you in, maybe the question itself should have. "Determine if a function exists in bash". I would further point out, that while the -F option does not exist in zsh, ...
Difference between Dictionary and Hashtable [duplicate]
...e> is a generic type, allowing:
static typing (and compile-time verification)
use without boxing
If you are .NET 2.0 or above, you should prefer Dictionary<TKey,TValue> (and the other generic collections)
A subtle but important difference is that Hashtable supports multiple reader thre...
Disable HttpClient logging
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For log4j, add the following to log4j.properties (in the application's source directory):
log4j.logger.org.apache=WARN
log4j.logger.httpclient=WARN
For logback, the following logback.xml will kill the noise:
<configuration>
<logger name="org.apache" level="WARN" />
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How to redirect all HTTP requests to HTTPS
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@Cat, as I was saying in my answer/comments, if you're trying to "redirect all insecure HTTP [...] to HTTPS", this approach will not make those requests secure, it will just make the browser make them twice, once insecure and ...