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  2. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    X.2.XXX Mailbox Status. X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 .

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.

  4. Heart Failure with Reduced Ejection Fraction (HFrEF) - Healthline

    www.healthline.com/health/heart-failure/heart...

    Diagnosis. Causes and risk factors. Treatment. Outlook. Takeaway. Heart failure with reduced ejection fraction (HFrEF) means your left heart ventricle has weakened and less blood is being pumped ...

  5. Leukocytes in Urine: What You Should Know - Healthline

    www.healthline.com/health/leukocytes-in-urine

    High leukocyte levels in urine could be a sign of: a urinary tract infection (UTI) a kidney infection or kidney stones. an obstruction in the urinary tract or bladder. a tumor in the pelvic area ...

  6. Ten Symptoms of Heart Failure Getting Worse - Healthline

    www.healthline.com/health/heart-failure/symptoms...

    increased shortness of breath. swelling in the ankles, legs, abdomen, or other parts of your body. fatigue. chest discomfort. sudden weight gain. reduced exercise tolerance. persistent cough or ...

  7. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. [1] : §21.1.1. 180 Ringing. Destination user agent received INVITE, and is alerting user of call. [1] : §21.1.2. 181 Call is Being Forwarded. Servers can optionally send this response to indicate a call is being forwarded. [1 ...

  8. Fatigue and Exhaustion: Causes, Symptoms, and Treatment - WebMD

    www.webmd.com/balance/how-tired-is-too-tired

    Allergies, Hay Fever, and Fatigue. Symptoms: Fatigue, headache, itchiness, nasal congestion, and drainage. Allergic rhinitis is a common cause of chronic fatigue. But allergic rhinitis often can ...

  9. Oppositional Defiant Disorder: What Is It? - WebMD

    www.webmd.com/mental-health/oppositional-defiant...

    Here are some signs to look for: Throwing repeated temper tantrums. Excessively arguing with adults, especially those with authority. Actively refusing to comply with requests and rules. Trying to ...