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What is a stack trace, and how can I use it to debug my application errors?
...ace:
Exception in thread "main" java.lang.NullPointerException
at com.example.myproject.Book.getTitle(Book.java:16)
at com.example.myproject.Author.getBookTitles(Author.java:25)
at com.example.myproject.Bootstrap.main(Bootstrap.java:14)
This is a very simple stack trace. I...
How do you make sure email you send programmatically is not automatically marked as spam?
...st the email-address (e.g. "John Smith" <john@blacksmiths-international.com> ).
Monitor your abuse accounts, such as abuse@yourdomain.com and postmaster@yourdomain.com. That means - make sure that these accounts exist, read what's sent to them, and act on complaints.
Finally, make it really ...
Redirect website after certain amount of time
...
<meta http-equiv="refresh" content="3;url=http://www.google.com/" />
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How do I pull my project from github?
...ect on github that I have been working on before. However, I wiped out my computer and I am wondering which git command should I invoke under my username to checkout my project again so that I can push my latest changes to github under my account.
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Artificially create a connection timeout error
...by the firewall that simply drops TCP SYN packets. For example, www.google.com:81.
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How can I generate a self-signed certificate with SubjectAltName using OpenSSL? [closed]
...olves modifying the openssl.cnf file. You might be able to do it with only command line options, but I don't do it that way.
Find your openssl.cnf file. It is likely located in /usr/lib/ssl/openssl.cnf:
$ find /usr/lib -name openssl.cnf
/usr/lib/openssl.cnf
/usr/lib/openssh/openssl.cnf
/usr/lib/ss...
SmtpException: Unable to read data from the transport connection: net_io_connectionclosed
...ervices to allow plaintext and encryption on the same port using STARTTLS. Communication would start using plaintext, then use the STARTTLS command to upgrade to an encrypted connection. STARTTLS became the standard for SMTP encryption. Unfortunately, as it always happens when a new standard is impl...
Add subdomain to localhost URL
...n, you can't add a subdomain to it like that. You can, however, trick your computer into thinking it owns a specific domain and test things that way. For instance, if you have a UNIX-based operating system, open (as root) the file /etc/hosts and add a line (or lines) like this:
127.0.0.1 example...
Sending message through WhatsApp
...
UPDATE
Please refer to https://faq.whatsapp.com/en/android/26000030/?category=5245251
WhatsApp's Click to Chat feature allows you to begin a chat with
someone without having their phone number saved in your phone's
address book. As long as you know this person...
Sending HTML email using Python
...# me == my email address
# you == recipient's email address
me = "my@email.com"
you = "your@email.com"
# Create message container - the correct MIME type is multipart/alternative.
msg = MIMEMultipart('alternative')
msg['Subject'] = "Link"
msg['From'] = me
msg['To'] = you
# Create the body of the m...