References: https://www.igvita.com/2013/12/16/optimizing-nginx-tls-time-to-first-byte/ use-proxy-protocol ¶ Specifies the sampler to be used when sampling traces. The available samplers are: AlwaysOff, AlwaysOn, TraceIdRatioBased, remote. default: AlwaysOff main-snippet ¶ How can organisms whose bodies require a near-neutral pH ingest acidic and basic substances (a human drinking orange juice, for example) and survive? Buffers are the key. Buffers usually consist of a weak acid and its conjugate base; this enables them to readily absorb excess H + or OH –, keeping the system’s pH within a narrow range. Nearly all proteins can function as buffers. Proteins are made up of amino acids, which contain positively charged amino groups and negatively charged carboxyl groups. The charged regions of these molecules can bind hydrogen and hydroxyl ions, and thus function as buffers. Buffering by proteins accounts for two-thirds of the buffering power of the blood and most of the buffering within cells. Hemoglobin as a Buffer

Authors: J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix Defines the timeout (in ms) after which PostgreSQL query semaphore resource acquisition attempts will fail. Such failures will generally result in the associated proxy or Admin API request failing with an HTTP 500 status code. Detailed discussion of this behavior is available in the online documentation.Toggles client-server TLS connections between Kong and PostgreSQL. Because PostgreSQL uses the same port for TLS and non-TLS, this is only a hint. If the server does not support TLS, the established connection will be a plain one. Sets the time, in seconds, during which a keep-alive client connection will stay open on the server side. The zero value disables keep-alive client connections.

Activates the cache for connections to upstream servers. The connections parameter sets the maximum number of idle keepalive connections to upstream servers that are preserved in the cache of each worker process. When this number is exceeded, the least recently used connections are closed. default: 320 Note: ssl_prefer_server_ciphers directive will be enabled by default for http context. ssl-ecdh-curve ¶ Sets a timeout during which an idle keepalive connection to an upstream server will stay open. default: 60 References: https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_reject_handshake debug-connections ¶

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References: https://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive upstream-keepalive-time ¶ The database schema to use. If unspecified, Kong will respect the search_path value of your PostgreSQL instance. newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\) Figure 26.15 The pH Scale This chart shows where many common substances fall on the pH scale. Buffer Systems in the Body In this reaction, the conjugate acid, HF, will neutralize added amounts of base, OH -, and the equilibrium will again shift to the right, slightly increasing the concentration of F - in the solution and decreasing the amount of HF slightly. Again, since most of the OH - is neutralized, little pH change will occur.